Malicious PDF — malware analysis report

Static analysis result for SHA-256 c941296363d21c85…

MALICIOUS

PDF

76.1 KB Created: 2021-09-03 02:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d85e454f7c49853f58c4605d0d58212 SHA-1: fdabb54665712ce936cb27db0d618984ca88721c SHA-256: c941296363d21c851f0d15086ab55c7df58650236c50619707116247b196dcc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, which is not typical for legitimate documents.

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://inwebjor.ru/uplcv?utm_term=file+operations+in+python+pdf PDF link annotation
    • http://flygarfield.net/userfiles/file/5587725289.pdfIn PDF document text
    • http://westmont1970.com/clients/1/1d/1d0046bffbd1a03ca32bb02538d2ceaa/File/vakizevukusajuwobatojij.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119abb167874---xagire.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/tovadasiku.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/90054600226.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ohb7vp4h1bakfb1tan9vvd4053/83518940512.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/89111041108.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610593a8aafc3---72283951700.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/dcd5b6b5d3846832a66a3e31978626d5/81208810255.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/629770bde7da864b41c587518806ad2d/95854167367.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///jerukoduxapekemub.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/59657178230.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/45692568347.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/fozimutodazabivobiwab.pdfIn PDF document text
    • http://piecco.eu/upload/files/lagam.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/16vlcv2k88egs9tibirpjvdh47/paxuxidin.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6bc41136a4---13731701454.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/6aa2db85059f9893db6844100a22d4de/32703112461.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-7-19/20210719042925368729.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076f91498703---17941807211.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/pikefaxuduvij.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ce991435e---36768467664.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/menetoraweradumo.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/megidumexixanilevufu.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_off0000c45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC45D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6F 17476 bytes
SHA-256: 6fd406316cf6bf6a4a3b2430b3802dee8543952c01fea2a3f2d40fe03e3b0d53
font_02_sfnt_off00010a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 10684 bytes
SHA-256: 8c34a45fd4e8b627f6a9bd456d1e367456a7b9e5a767034fb190498a657707bd

Open this report in the interactive analyzer, or submit your own file for analysis.