Malicious PDF — malware analysis report

Static analysis result for SHA-256 869529293f5b3f88…

MALICIOUS

PDF

90.6 KB Created: 2021-07-28 02:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: bd65fc676a1b52fd4324c90472e994d8 SHA-1: 9506dc2f4ec021f041e400ac59fb5dc026e5c47e SHA-256: 869529293f5b3f88addd9e6b632ff74b0820efc0b8867323cd36f5dd43ad833b
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to unknown PDF files hosted on compromised websites, indicating a link farm or SEO poisoning attack. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or phishing content. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://rubyyadav.com/nbloom/fckuploads/file/33444662104.pdf In PDF document text
    • https://torgradio.ru/new/files/file/vogipax.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160750a30005fb---98232603474.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3faa123cff---kamuwijufadegolo.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/69666857732.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074003ad5890---55844528887.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/gekas.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/lelovolevopexemebew.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b429cfa6f---jilutu.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160866955d2f00---fabivodapogojipa.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/8f451fec550dfb7823afeefa709f9779/87242073914.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/tovakupusifukirutisozuso.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb357b2337---89911445694.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/58239057361.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ihaikndfbmjegkqb4dqeolval3/26681339949.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/cfed0a60dd8ffc3cf5aeea3da4a2f012/tisalexusa.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/61790470879.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/gatogkpbqi8peu2dshcvpiitjj/18869805634.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/6c6333d92791dd40e06ec8529bc14b15/6652069234.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0644480c9bb23ec66989396d822cfffe/ximaf.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/rulurasede.pdfIn PDF document text
    • https://mszukam.pl/dat//file/loneturogununi.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/dtpmpd7bd1morb7atetf54t7ca/ripubovote.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/41488873652.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/kededavobevida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=history+of+space+exploration+timeline+answersPDF 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_off0000fdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAF 10932 bytes
SHA-256: a597996617a3574c8b10b7f5b66aed945069894c39fa16516ebf37046f1e4f05
font_01_sfnt_off00011717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11717 16840 bytes
SHA-256: fdea74fb64527f8e6fdc76ac6111226ee7f56698635ae7cc91252134c1a8c424
font_02_sfnt_off00014327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1