Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5717535ffb60c4…

MALICIOUS

PDF

71.0 KB Created: 2021-09-01 13:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f6561431d8b15a381a533fb54a99ffaa SHA-1: f0421e7626439ed6e111d786d962ea9603f825d4 SHA-256: 3b5717535ffb60c4f2fd54b29787ec9b429aba63de3988c58203d4b6a2dddbb8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The 'PDF_IMAGE_LURE' heuristic indicates it's an image-only document with an action trigger, designed to trick users into clicking a link. The numerous embedded URLs pointing to compromised CMS uploads and disposable hosting suggest a link farm used to redirect victims to malicious sites. No scripts were extracted, but the overall structure strongly implies a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/129999330d6d67efa11b7da5d6cb5e5a/7227259214.pdf In PDF document text
    • http://peusch.lu/userfiles/files/50264142175.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/66504186877.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/b0q3uc9sfg0gsnl33nbbgrla85/20160109710.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/93103207705.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/buvagotabusowafifezud.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/77761231793.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607397774e107---63752995097.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/87423320326.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/47391170266.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/daxafajewofarinamim.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/91539961539.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c29ed745ec---44749457139.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/dexaloxubepevev.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d099490665---ruvoletesifuxinizofoseso.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/59277378579.pdfIn PDF document text
    • https://laps.pl/userfiles/file/96058017822.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/26211897869.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/bc78d6feb07a54a7ffc82419d9317a41/33540242558.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/smle0tljtsb9s62gt4sb3epg3c/sidusifolid.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/besital.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/fotepojirole.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/xinadonenorega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=all+the+ghosts+in+phasmophobiaPDF 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_off0000b7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD007 10720 bytes
SHA-256: 7e742e9dd3cfa9137560106958ec886490e5c3790c9cc5893a24bbd504524d6a
font_02_sfnt_off0000e83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83B 14336 bytes
SHA-256: 9d462510daf09c80ed5cb31d8800a523a7b9899594421c981baa3ef0bdf04605

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