Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cba1f89eac31b88…

MALICIOUS

PDF

86.1 KB Created: 2021-06-26 23:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d542955c3d635f66c66ac2a8980e4454 SHA-1: 2cb1ec11dffa84c49dad73294125f1fe4082951a SHA-256: 2cba1f89eac31b88fb683f09abfa771102f073a8cf7755a10dc1dd5268f353a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or facilitate phishing. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it is intended to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cructi.ru/uplcv?utm_term=account+information+disputed+meets+fcra+requirements
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098863333d43---vijefukeromidivifunapexa.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ugi84vlgn4uvu4it795o3io7sj/449407577.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/vb9ntefkb74tufkb3i8t2nomln/29212613591.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/6c661da1a77620d468e8463af116fec0/21812734445.pdf
    • http://bahattinburyan.com/userfiles/file/54735048576.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/f7bbd2490d9ee5a91932dce9f60f58c3/89939426257.pdf
    • http://www.asslar.de/downloads/178936026.pdf
    • http://al-bandak.com/userfiles/file/18489735730.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093cf7166728---xutogum.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab81f5b423d---vuvorevugod.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/jmajufroguc54u15jbcirifa4k/11650736464.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/s8ped0lt38s8ie1k9p0khk29pb/58418712697.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/f5otbp5nuactb00bt6dolsgom0/61861464540.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/0e83db546e37a1684c2ec10f9171dd8a/13789030926.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/d578ufq8iqt03bm9i22ijunkfu/xabowobipuziwowuwof.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5297ef63f---21251397957.pdf
    • http://moestuinwebshop.nl/userfiles/file/noforesa.pdf
    • http://skyfestival.kr/ckfinder/userfiles/files/gulupinakexasusabezarevig.pdf
    • https://areicon.com/images/file/kuresudixobev.pdf
    • http://absolutelyneon.com/userfiles/file/9628287577.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/fbfd4993c8d6f35795f279be479a8618/67542333700.pdf
    • https://abugfreemind.com/userfiles/file/20346882483.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_off0000eb56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB56 16792 bytes
font_01_sfnt_off00010368.bin
dc75d58391a114667b15dec16e15941b37dcf694c87662185837a1244238e306
pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 16956 bytes
font_02_sfnt_off00012fc4.bin
1e17313cbce3ef40a2c56f745e55d348b8181619b043d49f16fa8195c7b8da5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC4 10964 bytes