Malicious PDF — malware analysis report

Static analysis result for SHA-256 61bb8b1cbfe2252a…

MALICIOUS

PDF

104.6 KB Created: 2021-08-26 13:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4bcd719db221306f0fcc55a5d5fda9e6 SHA-1: 9292c4b3f129ec0a271d2e163716dd44d31abf7c SHA-256: 61bb8b1cbfe2252a2b721dad11f3cc7b80f2ba3e14cba8cccc35734a64ff7b05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=packard+bell+monitor+manual PDF link annotation
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b43ae69b9f9---tawawafovibisuguzoba.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/58146792b67494af1b0e1219b44c15ce/41594411250.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/50053192175.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079b819d08b1---jemuvizelixi.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/wipujodu.pdfIn PDF document text
    • http://rentaruedas.com/files/others/89408170253.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/gamexepixipevewuganinuz.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/cauc3orb6hgjqbu4bho6prhkfr/79418146616.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/ad7106c86bf71b049782f0e2e845bc1d/55844141923.pdfIn PDF document text
    • http://asvpp.fr/pdf/motobokulivikajukonev.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6a9e77e65---10084231450.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/2293ea55f33e318b9a15bc12361adfc3/90206795358.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/detatenodugibo.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/38ca74efe101e03eb258ce39c421044c/mowejawevonima.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16074405b2ba8f---zafenuvigemet.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/aea6b7383832dc86953c326d459095e4/3979387576.pdfIn PDF document text
    • https://tsegypt.com/file/lakudovujadofedej.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/xexabaj.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611443036fd0f---17082965033.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb51ae41cc---47996712960.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/626236cc64b139c284573e2ffc334677/mudusepadoji.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c88a5477d1---24214669474.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_off000132d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE9 18768 bytes
SHA-256: b848b3cb03275eea66775023eb2820c9d39408a5261b622ae8020b78978024d6
font_02_sfnt_off00017c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C95 10696 bytes
SHA-256: 5418b6dc50c3726157c2158ecaed1d4c79049293b387de7e8df8cc3270b83e43

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