Malicious PDF — malware analysis report

Static analysis result for SHA-256 3709289f12ee6bf5…

MALICIOUS

PDF

78.4 KB Created: 2021-10-07 21:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 10ba482c921b2dcc6bbffca23ebfba24 SHA-1: de0e40e48fc38af5e82a8d170b778f53fdd2ac3d SHA-256: 3709289f12ee6bf592ff956efc24f132951288813c0c508d04fa049da750701d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links strongly suggests an attempt to lure victims to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615eebdd83c2f---32436183154.pdf In PDF document text
    • https://marbletreasures.com/uploads/image/files/78669398118.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/78375224548.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/pufenebedibopawo.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0309d1bc5---siwojoxikuji.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/vokibobabaropesunoxalebe.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/kupivogojepikipizofo.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141f0445e576---tavedupasuxapevibuj.pdfIn PDF document text
    • https://gitimohammadilakhimpur.org/ckfinder/userfiles/files/jefobokuxobavi.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/vawilutesokegidixubo.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/ripuniluf.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/lekajumosafopewimusanid.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/53310192532.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/lilaxuzokovaju.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/77571995120.pdfIn PDF document text
    • https://tekartltd.com/upload/files/pofez.pdfIn PDF document text
    • http://marketingnews.fr/images/file/pupofotagotimudilasi.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422b0c9ca61---48767140908.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/larisirumidefo.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/rutezutepasetazapev.pdfIn PDF document text
    • http://veitali.com/upload/files/somonufomow.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210908214900.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/dasenabu.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/27691354897.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/xalomoro.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/laduwefoxatuwegunezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=have+a+snowball+fightPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9E 18176 bytes
SHA-256: 048f85784ac14dfc967e580e96a5f42a54618d1d6beeb528c4c2ce3bc4143fea
font_01_sfnt_off0000fb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB61 10676 bytes
SHA-256: 341f7075d6795f1874266116365509bd43e97a4ce5fa7e02199782a67539d32a
font_02_sfnt_off000113d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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