Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa934c17523cfc28…

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 02:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0bd112114df4aa1c6ca18c5fa5524ffe SHA-1: 05ea8ae1c2f944d199e30bdcb9abcaa21aa962f5 SHA-256: aa934c17523cfc286951a02979ae6fda6954a3812e487e6e77c2d9fece99ac53
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external resources, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://metallpress.info/files/genumodokoxugaxosoxepip.pdf In PDF document text
    • http://zxsolar.com/d/files/19254737155.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/sonof.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/51349780327.pdfIn PDF document text
    • https://yellowstonewildlife.com/53957907918.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/31ca22bc2d0b509bb914db0833ce90bc/46525533815.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a825ba6e58a3760a03055d1356dba607/gunuwarobetobaje.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608aae6eed18d---megujesateg.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160d30b9fcb083---nizozasavaj.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/92144121568.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/bilimosudakijijek.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6778b69fcb---2548240385.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/80160249494.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/taxepagepolemuvutovelut.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/4996425860.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160920182f2569---gizadibuvapilatutidigepip.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c767948cd8---zekivijibonusefikepisina.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/8402048ad7f3a96a5ccd469f3a179b2a/5984365093.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ad62aa3a0---varinefopalivaxaxuk.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ah0f0quklen271u0a0na7bs40s/gulufatimukerirabedemo.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/kegede.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/bavebiwevaz.pdfIn PDF document text
    • http://fxmeat.com/upload/file/f1cd34c735b38d932eed397561d5c9f3.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=parisienne+walkways+guitar+pdfPDF 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA54 18204 bytes
SHA-256: 3208c62c6087162e56ed86bdf50687c7114e8e5c8326b3c30d6f5d56dcd99f25
font_01_sfnt_off000109a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A7 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_02_sfnt_off0001125d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A74 10944 bytes
SHA-256: a28c10763d1efae0a868d58235720a312a8494e654aff39362fbe0bfd40d79c2

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