Malicious PDF — malware analysis report

Static analysis result for SHA-256 f050c3fc1d30e04d…

MALICIOUS

PDF

73.0 KB Created: 2021-08-28 04:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7cd768dfa2dbb4a50c7fa6e0f794e44f SHA-1: 2a08722a0bf32d96569b7c2810c0beff059f8e80 SHA-256: f050c3fc1d30e04daf4b009d2db30fdb477d0c01ab8bdc6bfd7c2b3d5efb0ce6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable domains, suggesting an attempt to lure users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://maintogelonline.info/contents//files/96343172307.pdf In PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/03c4d5d51b3d17ca46ee512d6dd01168/jowofonumenojoda.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/16359043526.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/63917021269.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/94814864143.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/nenifetevepovujoragozofug.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/wukawalamivunukefijesorev.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57ceca45cc---11319315713.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d88506901ff---20619385193.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608252329090e---3019835487.pdfIn PDF document text
    • http://eastbrunswickliving.com/clients/77672/File/38598054560.pdfIn PDF document text
    • http://meskerjager.nl/media/files/vivoloxuduxakulakanox.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087011ea5e84---62045255349.pdfIn PDF document text
    • https://angkalaris.com/contents//files/48563339052.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/5219567634.pdfIn PDF document text
    • http://atonoserver.com/userfiles/file/basometijog.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/93453744590.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/82440350468.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/digebumojosaxediperiros.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607690b40a511---69635547034.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102846189d64---95742942972.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/lojal.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/suwuteroragapuvixitad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=keep+your+friends+close+and+enemies+closerPDF 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_off0000bcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F6 10888 bytes
SHA-256: f9d69293031bd50b858f580c0c0dd632850b5b35c46ca07920ae323cd004f928
font_02_sfnt_off0000ee16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 15888 bytes
SHA-256: d55aa65af0b4c1e20c6bce149913f10ee923ded333f2c8086990f528bcaf2d44

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