Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb8c6418a16ddbd…

MALICIOUS

PDF

97.1 KB Created: 2021-08-10 14:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 647eead9fd32a8dbbba36f1f19d256e5 SHA-1: 1d87a4fdef451143509c075ed3d60db0703ee15c SHA-256: 8cb8c6418a16ddbd4791533dc9e353ea45102da461477c5f78b6d67882110548
184 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains multiple links to potentially compromised websites, suggesting it is part of a link farm designed to distribute malware. The document also includes a lure to enable content, which is a common tactic for malware droppers to bypass security measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/somobavovovikemizezigasa.pdf In PDF document text
    • http://joesservicecenternj.com/userfiles/files/vubozezer.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/43190103042.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cbf00e8a2---56499298245.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/ecdd54b9e799c7cb67af5bc430f45448/14168461741.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/34212136607.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/49713782695.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/ef5d0417f18563a7768d8b7b2cc8a965/tetipolubalosemigo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4b7ca776aff65e7ca06b0d2b655604c5/gixoku.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/72374750265.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-29/20210429201504327819.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/df06f92552899bc246924f6c9410280b/78271155766.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/bg52fc3072qcdcaq7hqp94gjdf/sugusagovafevoxoji.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/85b4f47c9881f20d3885ffbbe852df9e/lizutinobamadefu.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/galedezeguroruwizibixibu.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/rodojarigutu.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/3051273095.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fea0f0a1124e01d343309282a80073fe/libobatizofoxenusup.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/domopitibotupilonegif.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/6f3l67sndh5kkebm517jigai3o/lazinusetaperejalozuwa.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/57291442135.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759a2a746e3---7266896242.pdfIn PDF document text
    • http://clubcrudupsonoma.com/clients/1/14/14cf715f5cd05ddba197ceaa5938d7d5/File/30015490954.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4bc880ecd57c73207e7a668ca334f877/xutejukikijofaxej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=inventory+control+template+with+count+sheet+for+excel+free+downloadPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11579 17464 bytes
SHA-256: 8cdfc172a3911511f1d47e74e0482bb038814661b961c622ed79ce7534805b2b
font_01_sfnt_off00014349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14349 11304 bytes
SHA-256: 4b69d76bbe119a83085e0d7f1cad3111409afda408115333bfd000227c45bf97
font_02_sfnt_off00015dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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