Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf1782c91a69c49…

MALICIOUS

PDF

72.8 KB Created: 2021-09-06 09:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0899313b7c165e7b59fdd86aecf253b3 SHA-1: 85e379200946a689dee5882ad8d969f189f2740c SHA-256: eaf1782c91a69c498893b4504cc09c5cc6475664877dedafb9751607bba0b570
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly flagged it as malicious. While no scripts were explicitly extracted, the nature of the URLs and the detection names suggest a phishing or trojan distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=bl+blend+worksheets+for+kindergarten PDF link annotation
    • https://etonbio.com/newsLetters/images/file/46955969364.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/o036b6hsb9gkuanrp5mar1lrmb/fekubime.pdfIn PDF document text
    • https://go2germany.ru/files/file/gamugizubasumagiko.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/17769421656.pdfIn PDF document text
    • https://epiphanych.com/images/file/dadovetodujodozadorigaj.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1065a4526---kosifisirijefezoxu.pdfIn PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/24731636094.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/favujajijusigisuzebu.pdfIn PDF document text
    • https://emmaushuis.org/pages/26304319277.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/lb3mom2k69jqkvdfduer22ejn9/kaketebopuwi.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430073717594042.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/65966703773.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4947dab399c0fd77cbecf8927c8b63e3/4897940652.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/3988b5ae50dc95b8b86a8b5ef5c91212/71684698588.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/emiwepobisonin.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d01ab62707---20176146570.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/kamironasugaza.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/93707145215.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/gemowa.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/cu3s9pln77b10qr1r8q0j55s5a/kasawegixanidozuzijeg.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/dikarodasenexosomotijit.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e5b318922a---47906032964.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ff3fb492f---wokaku.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/babinivaximos.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/99344172950.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_off0000b79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79F 11004 bytes
SHA-256: 6820bbb58a61a09c47d7fceb17e72584079b3f4c09c45f20365af68690961f90
font_01_sfnt_off0000d0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FE 17904 bytes
SHA-256: 049c3cd1fc4202e62f4466293ea8dff102ec77b496d05e5b20ca318b21c8f943
font_02_sfnt_off0000fd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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