Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae025b84e18fee8…

MALICIOUS

PDF

76.0 KB Created: 2021-09-02 17:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4e014355e8ed857857d0b5c6ca77ab22 SHA-1: 88709f759a726bbeead13db77d05918fcd806bb0 SHA-256: fae025b84e18fee86b51568dc0510e447d9974108a13b5d064e46e2b51452cda
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous links, many pointing to disposable hosting or compromised CMS uploads, suggests a link farm designed to redirect users to malicious sites. The document body itself is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://kaithompson.com/userfiles/file/pulefi.pdf In PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b86306b703253c290049c4bfab5c2f64/mebuxarebarisijofolejuv.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d8ccc42c1---raxopisonot.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/69388757015.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/99287270425.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fdb6b5641---19332744471.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/roliwixilo.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/c7b90d04a47ddee884e8b7095d2df5ec/nudupaparax.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/5623f6bee45a08ce51b7ae5c381f303c/1526112056.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/mesawagodem.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/digalizoboxufadezu.pdfIn PDF document text
    • http://innotack.com/userfiles/files/kozizet.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/zituzugolawelaganenevos.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afce8dec597---44073162101.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/miwuj.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/goridibef.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/lusivamudupudoxufijonobop.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a46f9dd51fa---posoretezapu.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/tdt2ab0vjjhqfr2ue925f70eui/jinowepenore.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/jinowulobelosu.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/97648651753.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8a0276d0125c3381301e446f2c8af864/1781447752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=list+of+cghs+approved+hospitals+in+bangalore+2017+pdfPDF 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_off0000c1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BF 17672 bytes
SHA-256: c416fcf00ca917fd9784b2634ab5cc5201b980ba43190aa55f91364dd58f0059
font_01_sfnt_off0000efa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA4 11408 bytes
SHA-256: 69cd79d8b42c04587c4e060b558333a0dbd855dc239291eb21622f8873951af6
font_02_sfnt_off00010a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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