Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11d4db7110fec02…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 15:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79148b7c9705113b2e4ec883d69365ec SHA-1: 060f226a2753248ed9e336026ca308b18f564872 SHA-256: a11d4db7110fec028ff9956ba25dd01a8e06d6455a0485e027ac3aa20e71487f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs suggest an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://laborke.ru/uplcv?utm_term=bitmap+images+are+made+up+of PDF link annotation
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/6c494549e90500dd809882cf6649fd44/46557585796.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/48666750593.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guviruborejovupurute.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/d0315537e3466161af32f6a4f440ce2b/48349444260.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d86ef403d4---8562216906.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/wabenulivisiduduz.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfc8dd6c69---roxiwi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc99a7a01---kozidazomuperedisiguzim.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4aded87b21ec99246a5cc96cfd3faf26/nijidaforakexamobe.pdfIn PDF document text
    • https://eternalbliss.net/file/kebotipifegatimedet.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/jofofofuxegasevaxaf.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/ouc90b64g3b1oi1dj0pv1cbfpg/mabudurutov.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/77300965294.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087da610b496---fuzunapitewize.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/bekupelu.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/92127c570513b1a5fdea0b37a7b47529/jobigupodinebagigimokoki.pdfIn PDF document text
    • http://erimti.com/userfiles/file/nesafugakulufaxazawigegud.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d7f07c7112a514f6b212c1927b8e3a0e/51868044832.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/67130464109.pdfIn PDF document text
    • https://ghnservizi.com/file/12052513976.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0q8elgete0a72hflr67e5jabl4/kexapedaxaso.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///12192378095.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/73337450187.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/15819984434.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/tujuderedobunarakuv.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_off0000e1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BB 10844 bytes
SHA-256: 45ab6da82e1f7fc02dc15a30a826c585f8c03895afc3ed196c5c327d3cdb5d24
font_02_sfnt_off0001129c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129C 19276 bytes
SHA-256: 0da5d7db6112c21beefe7d75bd71f2675af2504041163f6fa388f955aee0b0a3

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