Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c616c2762c476e…

MALICIOUS

PDF

126.7 KB Created: 2021-06-29 23:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0c75ba199225adcb3c09318b9b36253b SHA-1: 8582017e8ae4299673aa69e7ccae359554bece22 SHA-256: c0c616c2762c476e6cd8dbcc745c07775508bc0e1e600279661a1bf3c06d44e8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by ClamAV and an ML classifier, exhibiting malformed streams indicative of exploitation. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links strongly indicate an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9559

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://hometeamcorp.com/images/usr/nagubebuwigavananupuzi.pdf In PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/5a4c5b44c8f14f7255d9973a9743596d/sarowumerex.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160848707ed49a---gudojazuri.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/26531373517.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/t2k0drp87r6ev80132rv4dggpf/vomilovufusopubajilumo.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076312106d5a---wovonalajusid.pdfIn PDF document text
    • http://rayanchem.com/d/files/71137597160.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160821acb51e7c---93097453162.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/07d2f09e0cb88f2f761bb743af189fe9/84508977453.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/ziferozeta.pdfIn PDF document text
    • https://edbcagliari.it/file/roletavimesebevaforonod.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080ea01a79bf---dawanidemifaxarubakud.pdfIn PDF document text
    • http://dalaichau.com/files/13448547417.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d8b1405565e6ac6083bbd6348d528174/mogopoviteliwulip.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/vusoxifawezefigofe.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095e96de716d---16182934351.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/39656521490.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/932f6b5cfe08784289c7487d96a2809e/19866002515.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cbf4db5c3---nakefibukedof.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/11084823460.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/96bef9324ac5c170be9ac5369b4858d7/sikugezoxeduxomota.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/30085557788.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160da875ce34df---pezejisofexuka.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/7516842003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+fruit+of+grisaia+orderPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC8 18684 bytes
SHA-256: df3077740c41cea61c86836412237327dd35afb6d40a50dc1aba253061db2e13
font_02_sfnt_off00012972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12972 25732 bytes
SHA-256: ed97038a735e6cc12c00d9bd4d03588743d830f835d67b172ec9e741c9548afa
font_03_sfnt_off00016631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16631 40596 bytes
SHA-256: 00a36c86e6d50970e5b2db1898e2b0ded73e3c35473e4f131c3e58d00e2c4e82
font_04_sfnt_off0001d50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D50C 10544 bytes
SHA-256: a07a8d501db060ec1342ec70002db546bedacc4a811ae6bd1e78e465f27fcc71

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