Malicious PDF — malware analysis report

Static analysis result for SHA-256 d124753d87e762a8…

MALICIOUS

PDF

74.5 KB Created: 2021-05-25 13:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86fe7e73da0f0e1835f52dca3d0d6389 SHA-1: 5545af47f1fba5fe0c5645f98d40f07f15d36e65 SHA-256: d124753d87e762a82bbeb0d48a9458772d26e93db57fcea46ab6d5ded694bd53
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/j9lqp7g3saafkdpbc8mhek6v66/rukowaxosanasinaniwovefer.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e70e49c142---47436151359.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dcf90ebe5---wepogaliwaliwawisinimil.pdf
    • http://activesolutionelectric.com/images/file/52307623665.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607def5847d72---dexasirufagibulil.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4b77664e7---72165835886.pdf
    • http://alliusie.com/userfiles/file/55384178611.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab61c7c1cbb---30007703929.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/879247284f84d4de95781e7feb5eae68/31735129355.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/302edd8c9a009cefe07fd03e6b169071/seworuxumadesadakej.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b53ef49d24cfd16ea0e9f4d95dad2d0c/93901820824.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f20e422004---46554179695.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607459f942940---jegulinero.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16075bf3ad5ea8---wajotumoxo.pdf
    • https://actor-conseil.com/files/file/wudajider.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/7008b45d93b1fb03df0775dd3341d920/vewawipemaxikokimeruduju.pdf
    • http://ytbozhuo.com/upload/file/191302544222.pdf
    • https://clubelsendero.com/img_pag/file/dobane.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+turn+on+a+coby+mp3+player
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e958.bin
dbc8473a4188332765f0f0306cfb4f9080daf056a2ab9d7f15fce71a297e9583		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE958 5360 bytes
font_01_sfnt_off0000fb91.bin
cc40466de6406cc3f0da88879408bbd8e284d8f9184bb99f0a8c069ca933d2f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB91 11436 bytes

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