Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5c9f13d901bdca…

MALICIOUS

PDF

72.8 KB Created: 2021-08-30 14:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 094c65fd99f7cf57aeb5d72cc7465799 SHA-1: a762f6a9d4bae7f7fd6ae55bb7eb88745847b87f SHA-256: 4d5c9f13d901bdcacf9c1a559ff3493aa4fd1a4588f2c9d7ddd660ba4af3c1ee
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The presence of link farms on disposable hosting further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ekransamara.ru/files/7913508830.pdf In PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/49390403016.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/pabikuzafe.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/xoziwikidupudi.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/pezomedaxevasupe.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/61967484450.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/938eb6ab6f6a9053ce7ff3081cda7c38/26382965521.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/manadaredulagofozawogos.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/71491515024.pdfIn PDF document text
    • http://charivne.info/images/file/31281229750.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/16609174069.pdfIn PDF document text
    • http://guowangcable.com/d/files/niwomifotipeleliwazu.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b98f08599c---sujodesuritasazazekon.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/75642902540.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/58598750357.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/verefomufenu.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca7da68e38---43572665096.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/66734283936.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/nofazofiwopugenodedo.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b9263ab9f---teletonejavotobe.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/mizokemedezeriwob.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/67132881847.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1625359373_62026bd9b5.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c9cbf7935acb1b88b3a8f19fa5337dbf/toduwumanozi.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aabiqk735p63f549845gmd7nl6/nugubevimumozava.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/86271166346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=kerry+blue+terrier+pricePDF 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_off0000bebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBE 15632 bytes
SHA-256: 71c5af440c5764e36407217352bd3b1b37824a9ce4ff459ff3450da1409c9873
font_01_sfnt_off0000e5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEF 10156 bytes
SHA-256: 2831ea908edaddf7b6cf0c4fff53555e31d57ac68136588c3d25ac642e4c5a39

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