Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e4ef0a9d6316c0…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 23:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37cd7e040e92c7c4442db12e15f6bbae SHA-1: e88d2cfb2a06de64453ff3d95317204566dd50c3 SHA-256: f5e4ef0a9d6316c09c81785e6950cc2b8b58e074307ca072f4c2e56f3fbd03ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure and link farm nature strongly suggest it's used as a lure, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://huntic.ru/uplcv?utm_term=tutorial+membuat+aplikasi+android PDF link annotation
    • https://www.prshots.com/ckfinder/userfiles/files/vudil.pdfIn PDF document text
    • http://unibox.lv/files/text/godekiwaxob.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/lekawezegokanapofajukod.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/fedusasogamipirakijebo.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43617517577.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/tupijuvikizu.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/2f1a559dea5a75610472ca4de75f02dd/3971040673.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/volorawevuxalepi.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613f497fb5c23---58388728717.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/21109289780.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/kilaxeba.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/50033899983.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/legun.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/watojomazagidomosu.pdfIn PDF document text
    • https://lesura.net/userfiles/file/47749428895.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/jemerukejedojamexexisis.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/vetejorejibesesonigu.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/sulariwufowigekixataku.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/41203852553.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/povukutexopoxod.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec8332d01d---34382075960.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f25d6f785ca35534aa8f5ea73268567e/61099792798.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/tomelakikovotaxujevaked.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/97972370748.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/pajisom.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/59799391721.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_off0000ecb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB2 10848 bytes
SHA-256: 63d27c3c60cd40f7b9bf92d5030196e13eca9128843a95216194bd1f867838fd
font_01_sfnt_off0001057b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8D 16848 bytes
SHA-256: 4a0e44b90f118d963d67bfd884e87a1fc61129e570b0260c9d20501cbadbfaaa

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