Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd72beec4502f8c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 21:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 47b60c6b38f44ce3275c09f1f3ca4fc8 SHA-1: d407f8d91fe771f390835853feac36eae8dd6e7a SHA-256: 8dd72beec4502f8c7d19d900a989dd6e4b479a9b526f74f214092c55b45dda1a
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing trojan. It contains numerous links to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it may exploit PDF vulnerabilities or embed malicious JavaScript to achieve its objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=9+anime+download+apk PDF link annotation
    • http://resurrection-life.net/userfiles/files/wakovorurujulejafana.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/vemojudativorujotalu.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/zarupenuvanafeka.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/2806048285.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/zorasezizoma.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/33781285426.pdfIn PDF document text
    • http://llux.vn/uploads/files/kadoladosazisasifob.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/8f89f213ede9342ab93d85dea41392e2/95067242487.pdfIn PDF document text
    • http://crm333.com/documentos/file/55018629374.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/23985854735.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/xufomulup.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/17897741596.pdfIn PDF document text
    • http://chinahanaro.com/userfiles/file///83269468323.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/diput.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/ritofejibidolo.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/0ffbb1e5b3378450a5cbaf998c444a1a/xepafim.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/d7d7ef6c81547b91bf9dd4f1c9d49ffa/wizefovofe.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/tinilidi.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/41850319962.pdfIn PDF document text
    • http://scarpatti.com/files/62470463610.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/77009439769.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/lapepikoxovawutevago.pdfIn PDF document text
    • https://emmaushuis.org/pages/44461109277.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_off0000dcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFE 18260 bytes
SHA-256: c22aa51ca0f68c28ba41351895d674f382cf364b1abc711abb17068b16a3cfcb
font_01_sfnt_off00010c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C42 10436 bytes
SHA-256: db72631536e3eafb0259afd6bdb2951886857dd51a3ee4965611388c15f5e724
font_02_sfnt_off000123e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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