Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5dcc735c587c870…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 23:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6900e630f0ec406b3a4467a128287561 SHA-1: 7c7177283a94949c2c4a85a6fa785bd77655e2af SHA-256: c5dcc735c587c870f66e29cb610b0517afa134fb6be2f4bd92a8fe3af7003003
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of 'utm_term=zynga+poker+mod+apk' in one URL indicates a potential lure for users searching for game cheats or modifications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321f192208a---varinawuliv.pdf In PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/60781289874.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/bewugofolabemegu.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/20447392711.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/77cd7d6a591a7a978da7a6e538fe523e/zarujibel.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/wefeguf.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210913043609.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/p3mb29ruge7d4co4odbuqso7lh/pomudajuxi.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/wekogatevovibugobonewap.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/97309696826.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/newomosewapuropubuxigasob.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132401c71472---vexasopononetaxiwaxonu.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/96997195267.pdfIn PDF document text
    • http://uteambio.com/upload/files/38451319189.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-07/images/files/86402020804.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/37761947613.pdfIn PDF document text
    • http://yibetter.com/data/files/zitivap.pdfIn PDF document text
    • https://service-panev.com/userfiles/wisesoxuwakekid.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/figoper.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/75530323879.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/75774783198.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/sovuse.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/15112281469.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/jixekabufewufolozu.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/68627928857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=zynga+poker+mod+apkPDF 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_off0000d811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD811 10500 bytes
SHA-256: a3e0abbe295f39f50f556d8da2e9fe1d3b0c0576a899e4d167eb9f6984652bbd
font_01_sfnt_off0000efba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 18788 bytes
SHA-256: 23cba3ef7cb13fca7b142dae16f65692f5adc4ac83a123b9a269e4aecc1c1cd0

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