Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ab93c93c37334a…

MALICIOUS

PDF

87.6 KB Created: 2021-09-13 04:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a9c51199b0cbe0575584e0876e8b09ad SHA-1: 4b0cec4f4505167948997023ae8913579bdee133 SHA-256: d0ab93c93c37334a3c3f142eb7bdf2a84ba1fa11f095e5702d34d03b1c249677
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised or malicious websites. The presence of these links, combined with heuristics indicating a link farm on disposable hosting and compromised CMS uploads, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://irlanc.ru/uplcv?utm_term=create+2d+games+for+android PDF link annotation
    • http://pereplanirovkaoblast.ru/pict/file/lasijipuzov.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/mapikafebofu.pdfIn PDF document text
    • https://areicon.com/images/file/jozaxaxizeke.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/86730946801.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134ca0d26b8c---83638494315.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/62938926913.pdfIn PDF document text
    • https://rafautama.com/uploads/file/38447524544.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/78320233492.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210903135812.pdfIn PDF document text
    • http://hidropro.hu/upload/rumifes.pdfIn PDF document text
    • http://protok.pro/upload/files/57892412530.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/49882288605.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/vizawasolidemusivo.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/46992993671.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/85724054838.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/nevovuloz.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/10214165439.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/fabiretagivus.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1631261336.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb9f334915---87589921251.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a693b0927---158926704.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/76466545277.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/39625697638.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/6703708160.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_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 16904 bytes
SHA-256: 80dfdd1adfd32278a548666680ff64cf33c05669b3d59a87ff94570bb3139994
font_01_sfnt_off0001203d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13854 10804 bytes
SHA-256: 889cdd92ea7c4a3204ae1432d621a4fa24cfc96b50beea633665b973edbd1403

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