Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e541655e0a5b8d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-10 13:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 29b767215b87be0291d89fefea564a5a SHA-1: 37cb458982fcb8f7341a3647bfcb6c7bed10ff44 SHA-256: a3e541655e0a5b8d67bc21351bb1632f23d8c53c0682ca5ae9b9b21c250dbc64
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely exploiting PDF vulnerabilities to redirect users. The presence of multiple external URIs and a link farm heuristic confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://archism.ru/uplcv?utm_term=punjabi+film+gudiya+patola PDF link annotation
    • https://dpengineerindia.com/admin/userfiles/file/54332112843.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/90399439360.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/29118776710.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/78366211040.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/jalebibe.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/66489601533.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322e0d88b84---fakutivagewomenurare.pdfIn PDF document text
    • http://15881588.com/ckupload/files/67518565063.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eadd947f25---wozijotize.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/bedidipinujur.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/sosibagumefox.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/bemubarepimowilolefarena.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/47504061050.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/filuvujaropu.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/dibebewelomiroduta.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/gafovegenirizokimidonorul.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/ketexuxuzuz.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/sujule.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/2hhpq6e83e0t1ipcdisplb0l8n/74686552557.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/43172740985.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/aacd9ddd81ebe0a9b8708af8e127ca48/56569573610.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/14318817448.pdfIn PDF document text
    • http://halaljones.com/uploads/files/48377946153.pdfIn PDF document text
    • https://fong-cai.com/upload/files/dikit.pdfIn PDF document text
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE06 20772 bytes
SHA-256: 729cf26e41432edc4e725feefa43f5bab060a91234fd84fb2d26b5fadc6429d0
font_01_sfnt_off000104ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D05 10928 bytes
SHA-256: 9db04fbc82ff867a85bf0b804e5754075197d0fd4f6dc3368c45cac44bea0bad

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