Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e9734cab8d794a…

MALICIOUS

PDF

84.2 KB Created: 2021-09-07 16:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 94b331e062226aebc6586bcd90594b27 SHA-1: 9df7f7549d6a971a4896480eb8a7c73a816b577a SHA-256: c3e9734cab8d794a77232f59bf16e7f5bb178066556a4c89031c16119839ecf5
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to malicious websites for credential harvesting or further malware delivery. No scripts were extracted, but the presence of multiple compromised CMS upload links and disposable hosting points to a coordinated phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=canon+m50+manual+download PDF link annotation
    • https://angel-juicer.com/FileData/ckfinder/files/20210831_4304AB110B719FA6.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/dusil.pdfIn PDF document text
    • http://stisk.com/file/gezevevosoviwizivo.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/qum70me7864m62uvmpmt2f79u4/12445205052.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/lawawijuweluwisidije.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/vaxobag.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/87047534513.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/favirijunijov.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/rudovinumama.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/remimewexejewedejosexi.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/0563lm7ao37kq2u6ku9sjku4ee/58730279780.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc5bbb47eb---mejazi.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/7ff5ce74bdf3812e92a4753e83a66162/36735775729.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf461378b99---29732283056.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/3621e9767d59913b6b51430778bb725d/76367483090.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/notilagokixurazepirasaxiw.pdfIn PDF document text
    • http://sdds.be/userfiles/file/valupubenifapijilunusako.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/67204922382.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/43430705542.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d916c17e7---nidirumipajerinugudat.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/gorutelilezinunavunokog.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3f747ced7---xupidawonibulax.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/surisusu.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/789fd414e8829485f2998ffd063a5c06/35626188801.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_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 10292 bytes
SHA-256: 1280909c9f4f38e6c64bb6a6ed4c58dbed15dbc3f814886f9de76c6d5f640d2e
font_01_sfnt_off0000fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 18512 bytes
SHA-256: ecfd8d0cf6c7a1bc893c6ef62ea36b3609b12b4ed98d4608b47698ab89dca999
font_02_sfnt_off00012b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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