Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efbf57dd42ae40a…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 17:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4eaf2de6f036b5bf42d49c01c21c9101 SHA-1: d3295e85089cfa613e539b7d72df8b7f93c2eb13 SHA-256: 3efbf57dd42ae40a55d3959e229151a84ad0ebe236739523bb2676934ae03838
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

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 http://indagosrl.it/userfiles/files/xosivojavoxifekobob.pdf In PDF document text
    • https://carlojans.com/cms/file/76205790002.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/49779977573.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b805a2e9a47---zafabekilexud.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/b7a31527d765e67d546560ec1150c7c6/92779071986.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/8675418188.pdfIn PDF document text
    • https://geniodelweb.com/file/15836981639.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/daa28226b9a37a15b70c2fd80937425b/78489108358.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/nolirewujaromak.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/99873114450.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/64ff7e0ce60e74816c87ef52492b040d/70933466672.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/129c459809ae8bf8b0516e7517bb5c91/bujikepasikixoriw.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/oe9691bdmp51snk02sbn93cue6/30746031135.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/viveloferawigutajavere.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/junigevidawo.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/94357591731.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/88077188064.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/pumufujivatasopapal.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2d8572604---27135950256.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/nozukozibozaguxoxiwizo.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/jivegekulugoxutasezupa.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/74149495665.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/e92e978c4db7c0cc54e596b32b31bd33/80475802442.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4b88b08e1---31014060983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=peavey+bandit+112+solo+series+manualPDF 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_off0000db0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 11004 bytes
SHA-256: cee94b42cfacbb63f58aa4adb81e6e66d0666badab2022e0c7d17b6c39d59270
font_02_sfnt_off00010cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD1 18616 bytes
SHA-256: 50ccf8c0e85c546a969ebe73a7ef912545d69d1673745f990ac6d1e22679d85d

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