Malicious PDF — malware analysis report

Static analysis result for SHA-256 091303845d8c09f9…

MALICIOUS

PDF

79.6 KB Created: 2021-09-13 02:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d4e398fa24d2911b0f3ae02afd402282 SHA-1: 013763cb86abd6e51dc73c7a8c4823edd6774459 SHA-256: 091303845d8c09f909580177a784cb96909d0c09ed3e226684fe0cb670c1b2fe
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains. The 'SE_CALLBACK_LURE' heuristic suggests the document's content is designed to trick users into calling a phone number, consistent with callback phishing or tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://chongthamphucthang.com/images/news/files/27334254819.pdf In PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/99069006732.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/96211167561.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0kvalrhvsge1fskn6thhitgi13/wisobinepixusuzedil.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161330cfb3ab4e---wixalazibukawi.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/vafikapijefewutisijijun.pdfIn PDF document text
    • http://tencanpowder.com/d/files/gufazuretoriwu.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d74779a404---dafobifivetezuvegodiruk.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109090049325568.pdfIn PDF document text
    • http://coumert.com/images/file/gibab.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/5329099925.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/84240594440.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/53839274467.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161348ffa8dc43---1698475596.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/95849083088.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/31167466794.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/rekugutevipelinazimu.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/lirugujalerujomiwer.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376eb7ae426---91273794313.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/83928974922.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/gufugajopuru.pdfIn PDF document text
    • http://i-physiology.ru/upload/36828722460.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/polisarakewi.pdfIn PDF document text
    • http://lobi.md/userfiles/file/jekiwi.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/39991152036.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/34558231312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=metal+gear+solid+mobile+apkPDF 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_off0000d39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB4 10856 bytes
SHA-256: e0d2b84cc8d32247bcf6cba938b707d7ff90c058a94e0bdbb3008eb09d514870
font_02_sfnt_off0001045a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045A 17096 bytes
SHA-256: 99ef75b91b66eb65cdc77f438230c737c9fc8a75ee67bc66a60097ed90b4efed

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