Malicious PDF — malware analysis report

Static analysis result for SHA-256 18822b93b8852948…

MALICIOUS

PDF

69.6 KB Created: 2021-06-24 02:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 656e9773736572de6d56002f77141023 SHA-1: 18af407cb29f3ae1b1d70ac5c5572c099c406432 SHA-256: 18822b93b885294889c05bae505cb50ea23f4d47fe49f47f5a7591ed48d2e4a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains a URL that appears to be a lure for copyrighted content, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/uplcv?utm_term=barbie+fairytopia+full+movie+in+english PDF link annotation
    • http://elsekmont.eu/userfiles/file/38369777383.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a29914293---juvom.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/luhk89c1rq2bllcog0l9n0rrnc/24802990333.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/05db2a953d8f7ffa68829d37e9ae4220/falurowaduton.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/27219846931.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/0790f97985905c695aedfcfd291cb970/xisefotekubutuxefezizop.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/4f06bed581df0810270e662dadfd7fea/59018822260.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/7elrkd3c91h4pu616f2beee805/85534596472.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/8123400726.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/64987169092.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/sulitetekufukolumuraxevol.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/532442653581299bf14b876c6b52d760/27077933500.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836a0bbf2c0---46229609526.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/4b04lp5gra4mi11ic2rplhrd32/xoxorol.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/138f0fa5bb9155da3f415b73a4e670ac/73862474420.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/8mhj971rvoc2n66sskbbt5hlc9/mafuwupiweg.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c8699d3018962950e21285c85f986bea/62483840127.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD086 5668 bytes
SHA-256: 0cb928d35d69064d41b467c396a5d59ca67671c9decfe56aa63169e61b909b7b
font_01_sfnt_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 10888 bytes
SHA-256: bbbe0f580d3cdcbc81f75edd33a8b36bfb861301ed61e4a42e9f822c00846986