Malicious PDF — malware analysis report

Static analysis result for SHA-256 68af327c90d62605…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 08:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4b5a7dbbc3d31d3593b73770c92970e7 SHA-1: 09ebbc360b3af6d482c73792922f68f1b86251e6 SHA-256: 68af327c90d62605898cc018b43375880917a5d15b9a640a0f09485ab1c5fe50
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely serving as a distribution point for phishing or malware. The embedded URLs and the heuristic findings strongly suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=use+of+gravity PDF link annotation
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8c102c814---33836319995.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/87207442596.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c1eb62a85---63148957784.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aada7d83628---99663289774.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/topaxijadajanopurimawazaf.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/f35197855b8f0219c7f1cac0d6762632/keguretutelasarena.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/82995998178.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/he42e38suhkb6sps522csfrer4/gukojikamawafojolojo.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/98258433483.pdfIn PDF document text
    • http://ashioke.com/images/library/File/91359785270.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/77358325882.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160782e1f64ab7---99437383635.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/79395188960.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/xisusagebegol.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021051708592171.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/lawon.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/17189548024.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/0c19a96d76296252ea9113d177af82fb/90806491873.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/jitod.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608671de9d976---60831919104.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/b0080911df171187aa8fdaf33370f89d/xobuxilibepanamejepi.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8991782a4---risekuluri.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/63163209839.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_off0000daf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF0 10428 bytes
SHA-256: fef788a76d46167bd34ab5c077e7e2bda2b4d14301aad4ee6b0f6fa530f07d84
font_01_sfnt_off0000f2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADE 17284 bytes
SHA-256: 997827861b09af1f5188c3bfc9077f025af38e07aaf55040dbe8bfcc6733262c

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