Malicious PDF — malware analysis report

Static analysis result for SHA-256 462561c8179cb8d0…

MALICIOUS

PDF

76.8 KB Created: 2021-09-15 09:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c3247461541f7f15d4b89134214974fe SHA-1: 725e1a9d1f63c886d40616dd99dbb11143b6b509 SHA-256: 462561c8179cb8d0825b0105ff49d7359621c547758bde4bf38cd34d8e9247a0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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=pokemon+black+3ds+download PDF link annotation
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/41514135396.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/73a2392072b1a2abf3776c36a28ab3b7/lefedola.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5cee85a5d---bujivumijamefikomulokavu.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/40056047843.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/puzakujizip.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139a804bf328---golitodijiv.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/wewupaw.pdfIn PDF document text
    • https://fratellifurloni.it/file/vojivebodaxakodorebos.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/50920996811.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bebf7ce6d---50337357076.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/refapiwela.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/xozubu.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/16852065049.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/lagidikepapusawage.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/67495006150.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/bumosizoduladof.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/80523314234.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/lonemizozinesuzoru.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/71840085222.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/87936670113.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/nefajimo.pdfIn PDF document text
    • http://xsteelstock.com/d/files/16397550498.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/desilekasir.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210913110109.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/13343729167.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/baluzikul.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_off0000c974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC974 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18B 10732 bytes
SHA-256: 3442d439a11a213bed7a9817a90f6eb78530502f7a51b4ef746dbbfc796bbf2e
font_02_sfnt_off0000fa4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 16836 bytes
SHA-256: cdcb51b46c4c1805fb4d00bc4b7be8e6b4bd219d6dd4a24a30dbe9b215d79dac