Malicious PDF — malware analysis report

Static analysis result for SHA-256 0110b87fb1dd8dd9…

MALICIOUS

PDF

75.6 KB Created: 2021-09-10 16:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bbe0284c9be3d57f2385453f3dbb9fe4 SHA-1: c480e471e23412e6f6a411275de01f3185e9401e SHA-256: 0110b87fb1dd8dd97e4a55c514d4589f28691244b15ab695978ea7df18361a3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript may be used to further obfuscate the redirection or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=indo+tv+apk PDF link annotation
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/rakofosotumewagofix.pdfIn PDF document text
    • http://zerosquareonline.com/file/69919036146.pdfIn PDF document text
    • https://samowar.ch/upload/file/zisiwelodo.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ad970210b78adb604640260220a443d/soxifidefeloxemox.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/62632230342.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/25820195860.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/6768421741.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/sewibanutebaredikawexa.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/92842057046.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/f8c507ec6c72ec74fbdb44bf473503f0/52012446399.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/mobaz.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/8310558054.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/lodunizemutakojofuj.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/dodedetijapojikokifumow.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/pubevewejipebalozub.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/wenomij.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130121bed67f---mazimotofiku.pdfIn PDF document text
    • https://iword.de/userfiles/file/11508111412.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/23745164266.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/gepadanote.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/ladidewabibexuw.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/466072460.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/vewebenodus.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_off0000c661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE77 9956 bytes
SHA-256: 16c844bb5cb51f0835d2df8ea7c3139446c2fa30799628a5c0a5ce610428e683
font_02_sfnt_off0000f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 17288 bytes
SHA-256: 50c12fbaf7dd5bb888ac51109b81fbcf98a41fcf86ba695457c45ca8ae3c4583

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