Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5e2d636fd8d019…

MALICIOUS

PDF

81.1 KB Created: 2021-08-19 06:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 039cc49abf2761ebc6949c49c74c6674 SHA-1: f3ec5bedae89d4788ff5ffd4fde040df1635de7c SHA-256: 5f5e2d636fd8d0193908d8644b09359a136d0146e681d3966af0841d94620bd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely attempting to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://nomylo.ru/uplcv?utm_term=job+description+of+a+finance+administrator+pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b12897730f1---42811157363.pdf
    • https://lexcyberia.com/userfiles/files/31459888949.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8b157d9e0---ginusesisixudisopatat.pdf
    • http://erbamedica.org/userfiles/files/86349647683.pdf
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/vudazenajosirawuli.pdf
    • https://harkakotony.hu/UserFiles/file/58579985020.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e76ff93d11---91058876280.pdf
    • http://premiumdrinks.eu/userfiles/pipodizefutoba.pdf
    • http://vralumni.com/clients/7/71/71e0d721b250bdad3664bf54e70089ab/File/65503930016.pdf
    • https://tepihtrava.rs//files/86875692972.pdf
    • http://studioscoponi.eu/userfiles/files/46242413743.pdf
    • https://duproject.com/uploadEditor/files/55345091593.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608827baaaa0f---36415014330.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160985aa1bea5a---14613938857.pdf
    • https://espritgt.com/userfiles/file/37848264038.pdf
    • http://bagiez.de/userfiles/file/25959124427.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ee58d0d0cce---gubaxixisuvoritixetet.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qi1cjv7n7bdnnj78ps092knn86/gafobutanopobikuno.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609156ac2e0ed---toweme.pdf
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/zupujiwa.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16073c959a568d---7942460911.pdf
    • http://tomaszfilipczak.pl/userfiles/file/61108755042.pdf
    • http://baigeleather.com/userfiles/file/46447718624.pdf
    • https://fototipia.hu/files/files/nifesaliba.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_off0000d958.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD958 16792 bytes
font_01_sfnt_off0000f16a.bin
cf8856f2b1a238e42a83c7fe69dd9ae8d5e8c01d119953866cc1703590fbebee
pdf-font-stream PDF embedded font (sfnt) at offset 0xF16A 16264 bytes
font_02_sfnt_off00011b3b.bin
acc45f5514bb7fb6d6e54e24b11d4d067ab493cdbe7bf6bb53228c04b49d97e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 10864 bytes