Malicious PDF — malware analysis report

Static analysis result for SHA-256 efddd57e5a0560d5…

MALICIOUS

PDF

70.6 KB Created: 2021-09-16 23:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 03e900e8a34229740e1291e7f69366b8 SHA-1: 1d028cc22f49394610951360a3fba1761c58bf97 SHA-256: efddd57e5a0560d5321b59bba1cef9b5c926231655b211862e969eacdb1c9b01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chcial.ru/uplcv?utm_term=gangstar+vegas+cheat+apk PDF link annotation
    • http://platcometals.com/images/file/lepul.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/rupitorazi.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/94803721910.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210909220737.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/livilefozejitibova.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ebea6bc93---wugaduwokalamub.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a028ddff1e---35679931945.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/mozeritasedira.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/sedopogu.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/oq2tdbvo756n9opnkku68i6i30/zizuxevamidopoxire.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/wokiset.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/revizufesurumajekuvevade.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/12848895924.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/76455741187.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/46340733275.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/gagapedoxegukurejiperu.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/60366254201.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/pagijiguj.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/13345567365.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/xojunubamojenuveru.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/lenevidatilinafupoxote.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/96499591869.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161305b212f333---zeronupepigizetiv.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_off0000b7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B2 14756 bytes
SHA-256: 5891be19d0c3bfdba1ac7a29c9e9cef0b6a9fa58d39435a54e46e998384d7632
font_01_sfnt_off0000dcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB7 10592 bytes
SHA-256: 56ea74440337c2d6fbc5504da6e4ef9c5382b75335e1d67d375bc2c1e21c2b82
font_02_sfnt_off0000f4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1