Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bd7b39b8fd2c59…

MALICIOUS

PDF

82.8 KB Created: 2021-07-03 11:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3e84f19a7a63af30adf1efbb3015a4f SHA-1: d0f91b3e70fc55b75e4ac774f4b2869c553cfbf3 SHA-256: c4bd7b39b8fd2c5935b03adcea3b669d483faa23068ea1a050a34f51a113ed9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress upload directories and other disposable hosting sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://catamma.ru/uplcv?utm_term=meaning+of+vanilla+essence
    • http://askort.pl/Upload/file/jaxonulurogusodepiras.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160797af4e357f---40802254438.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/7gr6c060tdn1nadtnqqfbq0n0t/99391649237.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/fa7247026a03ed0b069c2ce3a432dd40/podokisejew.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607da10cde8d0---dapekilojol.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983230a5dab---kusofibigazugazinibi.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2e7ca3c6c---96580561893.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb391cb762---29881665873.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/c3a7b85d328d631171eac01f36d16f06/63434100965.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc79f4799d---28314368022.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fd2498ec0---69605417293.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f6c9843c6---77281226101.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/7f598945207e0aa4ea69913c99672a64/vefuwelemuzolurozo.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fad720f445---48902618718.pdf
    • http://ash-graphy.com/userfiles/file/92860673223.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f0b1ecd83ca010703d0d70c8ed23501a/wipimesu.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/e122e6f7ff90b9f18eda5823e4262c21/78493536064.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aba8001c59b---zitomesobiketasuki.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2245981cae---24747625184.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072cec35dd64---sofijazi.pdf
    • https://autoskola-scp.com/files/latokutufubumabagujaliz.pdf
    • http://teenaramainc.org/clients/875997/File/sekipu.pdf
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/3d3d8322b1dd3a3769f4b73529f43330/62250963699.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/7c7e3c34c5ba800904128db09349b879/52685806649.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_off0000dbe2.bin
7a8ff17ee7dd3f0f03fd521e553472f95db76ccc37520f0c74097935bf604f8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE2 19528 bytes
font_01_sfnt_off00010e89.bin
a29ea1ff4ce17ee5656693f2d89ce32393eea74efea242f0683ceb01c9113e59
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E89 10372 bytes
font_02_sfnt_off00012626.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12626 16792 bytes