Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7759f7e08e24c2…

MALICIOUS

PDF

82.9 KB Created: 2021-09-11 13:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 62bd9704b88e4de97f301e70922aead2 SHA-1: 2c4625cae07bb6fbd862ca413d377ff634f8078f SHA-256: 8c7759f7e08e24c2bb550c64e4674cbb5732f2c7ee07b065b59c849c1bab5441
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded links.

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 http://khonggianmang.com/upload/files/5544606987.pdf In PDF document text
    • http://rs-entp.com/upload/file/92338875298.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/dorudap.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/susavijowo.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/6069289820.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/72080812747.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/82554507018.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/vujikose.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/95102515926.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/vanavaxusir.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c265e5c9a---57399358086.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/1627855520.pdfIn PDF document text
    • https://alutat.com/data/file/59310512521.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/29190400722.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/redarigegepujebeval.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/menasunujus.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/46e15aaca11b6d90f687950b1b0c6cbf/filibaridujepusosidugik.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/74915737363.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a9cf26fa4f4b793d7c489ee41b520fcd/kunufot.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/74942503708.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/59207867573.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/tesububofibatezibu.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/161320baeaee7b---53553186915.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/ribogasulixaka.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/51449646374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=unblock+1337x+torrentPDF 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_off0000e222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE222 17060 bytes
SHA-256: 7cf02b57c602564ed0a1a8f71351f38c93eaff0cc0c2ed506a6c20cfa7c72851
font_01_sfnt_off00010df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001260e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260E 10416 bytes
SHA-256: e162ae8da8d0c2c498b09d5b1389e900ffec2d0079445b90ccd7760ede8dae46