Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca3a2993fbf431c…

MALICIOUS

PDF

90.2 KB Created: 2021-09-10 02:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: adbe10174ebb0c5103faa145df007c31 SHA-1: 6de6efbc6acbcd1e66a943ff2595adff9a7d7239 SHA-256: 1ca3a2993fbf431c626cde5c81c597f521790f0eff7849a9a10e14fd22b725f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan distribution. It contains a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads, suggesting an attempt to host and distribute malicious payloads. The presence of external URIs and a link farm indicates a likely spearphishing attachment used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://traffictkt.com/viking1/uploads/files/kudub.pdf In PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/93173854813.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/40997232703.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/6166228994.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/dureligawixib.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84229848652.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/jiwul.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/subunarusejidopo.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/terb23e2mnnqhle8qccgo2e8ci/40280787270.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/vonoxujediwekuponulix.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/46086968766.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/zovujoxuvigimal.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/8977137963.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/99307833820.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/juxen.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/zemefonuji.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/bowigazusa.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/xowitujanezezowunexava.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/xanewasefejurojej.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138460426dde---mavemudu.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/89687568674.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/e963e7b5b31fb9ed203074353b7604e4/xamoxebinafuratoliju.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/10349635646.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/jerimubufotojogefelifex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=harvest+moon+a+new+beginning+free+download+for+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 21444 bytes
SHA-256: 03e01f610e3c4d6455842f0259bcdb4f383164695fb35ab2c739050f4d4c386c
font_01_sfnt_off00012752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F69 10980 bytes
SHA-256: 559e276e18438c5e78d46f2834b1670ab9057cdbedf2458f97de1adbdf77c61a

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