Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1157bea03118315…

MALICIOUS

PDF

83.3 KB Created: 2021-08-24 22:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba74dfa55b703d0aa5f635835a062edf SHA-1: f4643ec9e2efdf5edef7e9926a74f17923656a50 SHA-256: f1157bea03118315f519ef8cbc226a7d2c370f433e697d9d3890c12c46c82e03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs appear to be part of a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160803c23d16d0---ledoxiru.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ae435708d---3197219101.pdf
    • http://mcleod-bobbitt.com/clients/64742/File/wosowisowazunilasopomefu.pdf
    • http://originalcheck.it/public/img_admin/file///bugewaguka.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b891eb298e---42701834254.pdf
    • http://seamacros.com/upload/file/96008524905.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160af88049e9c1---42758932623.pdf
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gonomebogafas.pdf
    • https://twfern.org/upload/ckfinder_temp/files/20210527124608.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/cbc05ae2e74967c2d0ef0d966a2d9d6c/17771793868.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/cohec9tdn908bdr4p0p8d2h1t6/62380908731.pdf
    • https://bangvetthuong.com/luutru/files/dimokatotusix.pdf
    • http://camwater.org/media/files/laxolegajarijipo.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/nlajbh09qjdgkl1kp7mcoe6soj/zegijezom.pdf
    • https://anthonygillant.com/userfiles/file/wadiw.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/14327598119153752d305fde127f336b/46088245821.pdf
    • http://a1climbing.com/userfiles/files/ximipobifufuzilurafitifu.pdf
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/8672977873.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609105f6c5390---97955345811.pdf
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/89335918828.pdf
    • http://retroldn.com/userfiles/file/68686160544.pdf
    • https://okud-istra.hr/userfiles/file/foseranorapafadegoxuw.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ed954273428---1471556368.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1611e9d2a9500b---bofizekekevafonajodebof.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cotd+price+guide
    • 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_off0000e44f.bin
51a1696d678742730876bf9ba2ebfa3c49cffac11230916f0ce0f3efb30bf6ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 10340 bytes
font_01_sfnt_off0000fb94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB94 16792 bytes
font_02_sfnt_off000113a6.bin
b5a659ba61384ca734cab0359940f6796b042584c716e50b01785fdf4abb2b64
pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 17244 bytes