Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3020b7248a87c79…

MALICIOUS

PDF

78.2 KB Created: 2021-07-02 18:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 141443c779023f1211f150242448538b SHA-1: 46b40cd18263f64f3058b1f568d0c41e2139c3ca SHA-256: c3020b7248a87c7961313ded24e74ad66bb52972dded11092f9bb268f8850586
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cructi.ru/uplcv?utm_term=au+contraire+in+english PDF link annotation
    • http://sk-uralstroy.ru/uploads/files/2058093341.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160798f99273b9---folela.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/769082d133b4d5b359d1282e6eb27d58/88503488006.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/waxowobokas.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/zafelewexaxumofenutekerab.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d30f1d16931---68841762836.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/8a1af89387d1f691394ccb6120ec2e38/tepoxatovib.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/52496753046.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba69ac01b11---pimusakirevemoxowe.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e04d94aac---zokenobirifugo.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c9faa602e8d---voruvirosobuxawujeni.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/meluduxixolamuxuzovokone.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947999620bc---sofikagezebinuj.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/6137039919.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/45882337898.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//lowokis.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd26b25d9a---nuvenozajabamujazitalik.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/tegexawiviremun.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/tmci00gq8ef2h7nrl6cb22o4mb/26755188562.pdfIn PDF document text
    • http://darec.sk/files/files/11821804745.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/vekiredukezaxad.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/96ci0qvjclt7glnu0rkv3h3v87/toxapobu.pdfIn PDF document text
    • http://inphilong.com/upload/files/kitebesana.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/hi3e075bbk5hua4oed61cie1la/rumovaxufato.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a716954786e---palonelavurinagivasubixe.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_off0000cec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC2 10592 bytes
SHA-256: ccf851229c5b117e67c1da8ce7f2acba30653e9cc5940d5428635538752d80fb
font_01_sfnt_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 17948 bytes
SHA-256: ad97a4a5d4c23e3e67f482c1f047cd1f9e7be8aab23c2720e25a2725e95c90ea
font_02_sfnt_off00011391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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