Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68b465e9998876a…

MALICIOUS

PDF

78.5 KB Created: 2021-09-06 04:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f75e748d59976ae395fdaaa29af2bba1 SHA-1: 916d56c1fd6a171e260b1f02c228b6abf7f35f57 SHA-256: c68b465e9998876abe9199a5a386fda5410552ff5d0282e2a3913069f907b0d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The presence of external URIs and link farms suggests the PDF is used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=fanimation+odyn+manual PDF link annotation
    • http://komputerzagrosze.pl/userfiles/file/zazezamilegulofukafa.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/tomiridagalamerat.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/acc635e72deaf79a7a89f7b2d0cf018e/wudota.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a440da87216---59429248955.pdfIn PDF document text
    • https://rcot.org/userfiles/file/22822611076.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/73641350431.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/72286918456.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///46133521577.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/93312830644.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/s8v99t9dlot3m1a0mt3tcav6km/74808876353.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gl86sp54jgce50c966adp5c8cs/sarotakofepowo.pdfIn PDF document text
    • https://medtek.vn/storage/file/suzekekezi.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/diditibik.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/mutalo.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b8881c414212c815b3a5fec6c690dedd/midive.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160edfb292d0c5---dexav.pdfIn PDF document text
    • https://hgb.se/filer/file/madiwabov.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/neligab.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801f85ef963---89191111102.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/89936271062.pdfIn PDF document text
    • http://quimicasorocolor.com.ve/ckfinder/userfiles/files/55532403860.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/ce8cd122a22f1958d017751ee9068a27/towamowoliwizabavivitis.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles//files/69320988495.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161004c8f8b535---dakuzifabipalada.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/77332936987.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/824ad0d4290cd943c3504684c56a7fb6/22298578226.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_off0000d2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 10200 bytes
SHA-256: 145f76135785695b6876b91ea0acfd61736f5683d9420c3b1da9c294c2929ff3
font_02_sfnt_off000101bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BD 16552 bytes
SHA-256: a9308819be896f23e43b77f0057b4a8142b48f87a123126677b5ce7662dd9da1

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