Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a064ee342550081…

MALICIOUS

PDF

86.0 KB Created: 2021-09-04 22:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b42041630b924f70656f47f399a56a58 SHA-1: 39d95abc9679abe7ca9e74fe7c1004589ae0dad9 SHA-256: 2a064ee3425500813ee556277a560d54b3508ba4c03ef0f6426d5e837d927d85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to funnel users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=psychological+testing+and+assessment+cohen+pdf PDF link annotation
    • https://hospvetcentral.pt/site/upload/file/32497381077.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/b3hchjks8ndlm9amm8umkhui3o/rexag.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/671fb4e7f1b0a2ec55372e32bff7bb2f/37808608396.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/zixerosufemepexiduwiko.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/kopedip.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796c4974da8---jokaxasifuti.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/eui9smaeq5ji56a02490vkked4/29250947825.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/99612274992.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/doropipurilevafe.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb5e09d0ff---fenezegokowarenowaw.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/58177933807.pdfIn PDF document text
    • https://angkagenap.com/contents/files/33459104496.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091f626e7124---kakopurulesa.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/4h9ocdknkbjb1arcd3b6vc8ml5/95158284958.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/wuramotikiwawevixidu.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160add2628a4d1---19358937767.pdfIn PDF document text
    • http://aven.su/userfiles/file/diduparikepinebofuvi.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/21483337822.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161134a5be180f---titilotozizajajivodana.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/15869341948.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d1f53f8fd---41127227449.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9e23256fb4bff5afb9ea036f9f556ec7/6598639859.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d93b3cf52f---jidodut.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_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 17496 bytes
SHA-256: 4ad5c89db64802bb7de8171911f5487567b48e762dbdbac6410d0036a0e01034
font_02_sfnt_off0001303b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303B 11080 bytes
SHA-256: f38dfdd4627e93ea5d3979da716d1c02b5397a43d7461aa525186cc5bcda4337

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