Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5865012fa3db0f…

MALICIOUS

PDF

65.2 KB Created: 2021-05-05 21:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b896e2bd83102c0f3b63b1a84fdd3693 SHA-1: 715e0970b2abc2b99bb1d1864cb7bb16cc2d0a1a SHA-256: 6a5865012fa3db0f00d1dc61bf9904864878e86946e07578030a1d92ecb5ec06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains references to 'Eider duck hunting guides' and application metadata, which likely serve as a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9696

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c894a6ac33---20779544634.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/bd9b8bdfcff7e16e5beeb188896d221d/lagezene.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da0103d2e4---danibawo.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/nfou0vfp7unbu06nj86ng0cao7/55076497690.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608d207789222---82962912403.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4cc733f99---roliluzekeke.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/29fa49ee67570134528cceef07083e80/xevovetorakitetisusowujo.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b3384d1ddae40416068d05e32b69052c/63497276986.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/e576dc8aaed069e6cd6b370e62c51683/nutanimowudege.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/6uu153i9gag2tb6sg9214phsf0/wuwebobu.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/2d9c559abc55e053f67d7b660be31e17/53610295131.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/8c2c333192065f4aa3c9e5d7befd40de/16564978492.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16092439651a62---gilizexuji.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/614300f1fefcccba26ebf81aa3fb6323/47452463869.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c161bf020---25919743298.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f33229ca1---jakusakokenofowet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=eider+duck+hunting+guides
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd18.bin
bce0d0520369fab174f814c3505b952879bef54c1dbc300e8c12f3fad317384a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD18 4980 bytes
font_01_sfnt_off0000de0d.bin
31f26888fa9fe37c72a027b61b05d542f2f04c4101cbaf8f6cc425823ef65d78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 10556 bytes

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