Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf76215a5390a9f1…

MALICIOUS

PDF

83.3 KB Created: 2021-09-04 23:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7607678d93d1c86e5c675c29f2e65235 SHA-1: b30c5c0bd173d62a34671d7f1537cc818366077a SHA-256: bf76215a5390a9f168b28be88be80b25e967123e558e0c2fc34c9c4849286f04
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crewmak.ru/uplcv?utm_term=vaporella+polti+manuale+d%27uso PDF link annotation
    • http://tythb.com//uploadfile/files/28097247014.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/napikimomunevunifilu.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/63332574288.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/9a7kt9q0bh9co2u1737brdl5mn/sufit.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/84508912256.pdfIn PDF document text
    • http://espokebar.com/uploads/files/84425049273.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/32895337549.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f91914dd33---34837949276.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/19361430554.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/97361416695.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/kinanopuro.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/lovofadafufufowedifaj.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/72678887073.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/zavegakalogasagekew.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/38099396399.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/dupebuvej.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d513910ac63---witiribakez.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/890dc1afd250ca5e59b788f7d65607b5/57501884375.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/hlrhvttdjkqimcmu5f1e2ccnl6/9315025462.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998d11c67dc---davaxawojapoxakonisaxoj.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/ecfe259cfd77b80a0dbaa9a8c1bbe77b/fuxasiburajojud.pdfIn PDF document text
    • http://954move.com/clients/4890/File/rejafolalalimateduloxo.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_off0000e1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FB 10656 bytes
SHA-256: 27a5b8139f4a812d892d2acf16ba9f891ff872d94fc1d4aafa001f3f6a1d6766
font_02_sfnt_off0001125f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125F 17336 bytes
SHA-256: a7da36a03f14b2fdd7daeae64906558593ac5a9fb4e13aca3a8b4019bdd1229a

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