Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3ac5a33f9e4aa5…

MALICIOUS

PDF

95.7 KB Created: 2021-09-17 21:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d8d3cf9a6efd70d9962ea05878057724 SHA-1: 369d907b8a1005e99686bd7b74465897e230a7e0 SHA-256: 1a3ac5a33f9e4aa57adc9df95daf6fe3e035ba869dc9da734ee4cbbfb92ef8d3
224 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan. The embedded JavaScript and numerous external links, many hosted on potentially compromised or disposable domains, suggest a phishing or malware distribution attempt. The document also contains lures to trick users into executing commands via their clipboard and a callback phishing lure, indicating a multi-faceted social engineering approach.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://poltinka.ru/userfiles/file/xonikabelagafilixeg.pdf In PDF document text
    • https://conviviodihera.it/dati/upload/file/jilokupivavesog.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/seravigofululemuv.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///78188866653.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/77448960111.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/11433274914.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/bubupokagitada.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/27307835589.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f1b49a8fb---21055476763.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df6112bcb4---49822513711.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/gakanadekikejiredo.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/gezozifirezijonutewefarit.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/pumivilobewakadukunugod.pdfIn PDF document text
    • http://neteyes.eu/editor_up/1600181574.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/2ba008b70a53b1e2eff572da06483aeb/votipar.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/fedesufadiwelafus.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/45115291992.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/poketabebopowin.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/muzojirogivudililuposof.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/53560107692.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/zupizabip.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/52226795924.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/gosurefuxef.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/4640867783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=i+forgot+my+pattern+lockPDF 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_off00010f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F09 19064 bytes
SHA-256: 43a60d54bbfff9b0285c4ec29db04e856470c92df436b0edeaebb33966d4e6c5
font_01_sfnt_off00014067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14067 10720 bytes
SHA-256: 90e14a244d200786e659e67951dbc59946bda48a72e796f80b9d4fd1769a0cc6
font_02_sfnt_off00015918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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