Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2fe264ee45d2393…

MALICIOUS

PDF

85.3 KB Created: 2021-07-12 16:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9e6010d7a70a1b1590239c7b329d2e9 SHA-1: 3f48b43fc83d38d689602575d64f117d79f11ea6 SHA-256: a2fe264ee45d2393eafbb8863f599df05786c6ba779954edd298add89c79c531
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded links are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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=different+types+of+martial+arts+styles
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745e336ef64---79670391146.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeada13b7f---84099979206.pdf
    • http://aftckwt.com/uploads/file/28879630286.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8abb480f6---85593357225.pdf
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/majoxaxolozosurujo.pdf
    • http://studioturina.com/userfiles/files/pogepovajesiwakilodum.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/nf39532oi3aaqoiecarl2hp24s/56505453274.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607f791d4b248---genagedide.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/75qqnnsvsgg183kk1jc070fr57/lorufa.pdf
    • https://nada70.org/userfiles/file/xevogulivujefusovalonu.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f38307078---bebovotukuvi.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cce06c0bf---nevarumejul.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-13/20210513015653609642.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608867f409736---jupavafavadiviz.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/qj93dr27gd9orqrvis70pva682/70217460819.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c58b29a7023---nepowedufinovazuz.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095b3eb8b569---66662048080.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bce3c88ad---71656500401.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a21ed054b---99413187674.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084e7e113168---76597554932.pdf
    • http://dmkaudit.sk/101/upload/file/3024736979.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160882dca13454---77606169447.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed5f.bin
a06049f88c4faf17616fe3e47c58c9ea02eaed3548db112dbaa71a5f2db6f379
pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 16432 bytes
font_01_sfnt_off00011749.bin
2244235ca8a7c884be1e7bc28883955b79f2c71c0a80e9a96490ae23ab14e3e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11749 10636 bytes
font_02_sfnt_off00012fa8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA8 16792 bytes