Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6b24e171be030f…

MALICIOUS

PDF

77.9 KB Created: 2021-09-01 13:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18fe0f4bfec2a241dcd15c450e65b7ec SHA-1: 8522989192a0dd28af0f81f2d66767f87db2804a SHA-256: 9a6b24e171be030ff3a95dfdd5024937e13df3aea6ed9cf7def65749023c5df2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple compromised upload paths suggests an attempt to host malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0196b39e5---949253958.pdf In PDF document text
    • http://augsburger-dartliga.de/uploads/file/bewopujokasiwukidilifutu.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/didijoxizo.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/qe9n64oeqhlekh9li89u27av8k/wusoxenufogu.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/bovepuxurora.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a639d113932---biloger.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/p55coa1n0aco93qjhm9f1mi6e8/bupukunatizoxifipeva.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/jawuwasisamawisulesuf.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/vujefapi.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/04a2a6445d2c2db506fd1a86b51add1f/29554659306.pdfIn PDF document text
    • http://tfforming.ru/d/files/lisiluvavilexeseburu.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/129ca548250a97fd858f186dcf3546df/85401028460.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/25645081791.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090c0ac81945---retevu.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/zigavumaxijatases.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/4fc0ee016dcc9e353aed7227921433ff/pekekojezisigigal.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/d25e2f8bd013e6189dbfab7d48966ca2/25802822365.pdfIn PDF document text
    • https://europartner2.pl/uploads/89757759480.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075f72641702---vidujavipabesiwoledo.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bfac4829713---34971647118.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/xunotuneze.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/53387214580.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/9517ea37aa7bfdf318b06fc0ddc033b3/mutalonixarilofagis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=subwoofer+lullaby+midiPDF link annotation
    • https://mediaget.com/userfiles/files/nojawokejadufejenupowamu.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_off0000c11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11F 21656 bytes
SHA-256: a6545e528d86d51cb35456ab025b9a558170033858aaba5b5da90f52f8f01ba7
font_01_sfnt_off0000f90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11126 10660 bytes
SHA-256: e58dde69739feb9d0375208ee6d1763b1e950ca9c8c28fe9165639786de5d8fd