Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c31b911b7fec01d…

MALICIOUS

PDF

85.5 KB Created: 2021-06-30 08:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a8aae2378a12fc658cd22692c6a125cf SHA-1: 537607e1b39e0e36deffab5de05d1be6c2b1f593 SHA-256: 3c31b911b7fec01d5143b909274921f88be238ca4e6e9932637912c81099c624
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to websites that appear to be compromised CMS uploads, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the presence of many external links is the primary indicator of its malicious function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/joqdmr8t6tnnuh82ojklrilj8m/tonevixodimasozumeve.pdf In PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ad5830c2f---gogepumafuxota.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3609363bae---kujujabiru.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/74vv3l8qfnc4fek2s4kg3og8r6/75644995656.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210622012239_i30wle.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d34f8c071f253d9f7bd9f5612af9c8f4/rebokazulibifevigisul.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/dedovadapu.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/sokegowagumaxuzuguka.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608537597f51d---69355324463.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce852bc923---51232408686.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722d6faeb44---82159688811.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3cd528f31---kizitakazebiw.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210618_061239.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948d6b884e0---jaxovibugaxume.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a5dbd789f6d039727c48d055517058a2/vaporezavovedoxixo.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e6dd80314bb9bdb5a4ac035ed5e7c61b/mududoxofoxusojonox.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b31556d9f---73773744602.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/13854995381.pdfIn PDF document text
    • http://arslanemlak.com/E/file/wenafabibusewib.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f3b54421e---lekuvizilatofaj.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/87593458301.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/bivorazigunefepebuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=nobody%27s+angel+book+home+alonePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5A 18024 bytes
SHA-256: 24dd6fff9f1ead35ebaa6326477fb6f53d0b8e8c34b4d3f74fd32c8b9b124cdf
font_01_sfnt_off00011803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11803 10760 bytes
SHA-256: fabc24d4ffe27ec9463d4e808a887cbb5a3609b1d0ce211bc65b3f8e90a96b41
font_02_sfnt_off0001306c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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