Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c572e2efdb89106…

MALICIOUS

PDF

90.9 KB Created: 2021-08-12 09:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21f871f53108d9c7e533589f2cc52280 SHA-1: 610fb7dc6f56509cd4108d32209dba430d30c442 SHA-256: 2c572e2efdb89106d4ddd5e2a7a23e3226cb5099499614e39df2b813da54088b
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 uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://doktor-okonski.pl/uploadimg/file/govalarixukiwemolotevi.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f6f46b79f0211525081f015f7e8ce277/13797622878.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/b42e7be68d9d21f8de3fb2a96090e708/76910190169.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609642c5878de---kimusezigipapolu.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/lsfod2br7jp0brkv7me1aa2kka/2553275922.pdf
    • http://seamacros.com/upload/file/gokitagaduberemojotakoli.pdf
    • https://likeevent.it/writable/public/userfiles/file/milisawu.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ae044ab5c---13275967162.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d93b6a306---55823836344.pdf
    • http://championshipsportsrings.com/clients/23492/File/zovixulutupawuruj.pdf
    • http://www.cerathai.com/image/upload/File/22916567611.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/a934232aeb6605b5faaf0907fe50c7db/85052660300.pdf
    • http://100gastro.cz/soubory/files/94199733601.pdf
    • https://ei-hotel.com/free_images/files/xuboxutokapapizomejenaxa.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/82pennenhfc9blijsm3t3ubva6/kuxetegagafine.pdf
    • http://rajskiewakacje.pl/userfiles/file/gaxifir.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/renomunuje.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/2chktvo4haipd2nbdl3oplvd64/94721347638.pdf
    • http://holidayinntorino.com/userfiles/files/mapodosaxasugagil.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/dibezivumorerutewudajep.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3f1239887---zikejinemusafesovuvonom.pdf
    • http://k1a.ru/images/files/file/57766774133.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3858b1b94---letofuvozepopidotemaselu.pdf
    • http://nccutrackandfieldnation.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/vajerewup.pdf
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/94158945192.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc113ab250---tofixisekizipajoder.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=is+the+near+future+report+legitimate
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa9f.bin
6145def0bdfa9d1f117b03e7b903ea784b881c42f836433a25aa343104e22cfc
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9F 10856 bytes
font_01_sfnt_off00011375.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11375 16792 bytes
font_02_sfnt_off00012b87.bin
d9623f3774a3ef91613ade2c4f4bba80b627625fbce085fc3a23efa790716183
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B87 18336 bytes