Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2df6978abaca775…

MALICIOUS

PDF

92.6 KB Created: 2021-07-03 19:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7cd9cc580ad6c5518a935d131f2e30cf SHA-1: 3c343603c31f4388469e82a9ace44d09032000d4 SHA-256: a2df6978abaca77560c671f85702de3fd652ab9f311df7bb5dc7bc030c9d7483
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • 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.
  • 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://questyme.com/userfiles/file/sibaju.pdf In PDF document text
    • http://malbreil.com/userfiles/file/81300522691.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/cel37v56tdh426spr0b3evt375/setimedu.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074f902c085e---fusav.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/tabiweralekabim.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160826ab51132e---38677769485.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b58ac51e2---pijamiri.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///93678518732.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/14150686494.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/4389792233.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7014dbd9e---21071754618.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/3a7c0f7dce3279fd25e337203a87e7b6/wasukefojidefuduzonenuwit.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/4fad42fe25602b9b698d53a9e29f3d48/8707246875.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/78666129411.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834bc36ecb3---68100435049.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/vupav.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9ae86f6a2ed14e9e55e576163a891949/28020986959.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb41b9881---zodusinam.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a3be135f8---14547270292.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/sotagavab.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/7q6m76pdq8qd54javl0lqpbb92/vupipenis.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/0d3d7828829e825c96a890fd716c9c5e/podataxozuluzewidu.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb34aa11ad---webugunatogabuzukeram.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/23695827257.pdfIn PDF document text
    • https://lasanisports.com/files/zeriwakunevuzasuxev.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/22036444384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=thermochemical+conversion+of+biomass+pdfPDF 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_off00010714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 10956 bytes
SHA-256: cecffa5672fc3281523dbfe4260acd234656f63979b587c8ae5cdcf92c7a0b0f
font_01_sfnt_off0001200a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200A 17048 bytes
SHA-256: 84d4b6af082bdd457700eabc5a12e722d6ea49b094e67fa4140c40cddbfb5bc2
font_02_sfnt_off00014cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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