Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7d51b20ec9d3a5…

MALICIOUS

PDF

87.5 KB Created: 2021-08-09 10:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 431e706e5f68d2550bfbce8f96788eae SHA-1: 1b0ec036cc9f01ab248385b8a971dca9637d1cd2 SHA-256: 8b7d51b20ec9d3a54a408ddb8c53dda507ad8c141d694c041f6b419172dfb0fb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a callback phishing lure. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute or host malicious content. Although no scripts were explicitly extracted, the PDF format and the presence of external links indicate potential for further malicious activity, such as directing users to phishing sites or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://crewmak.ru/uplcv?utm_term=liste+schwache+verben+pdf
    • http://romanakladatelstvi.cz/userfiles/file/13818756768.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161068ded96e66---jeduzaruzulekidite.pdf
    • http://graham1978.com/clients/79565/File/kumoloximokidosasim.pdf
    • http://evolutionchonburi.com/userfiles/files/45236325158.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/27qr21js2o1jpoe6c3rv6a3fs2/jafemamiwironimi.pdf
    • http://bjsprt.com/uploadfile/file///2021052723524716.pdf
    • http://agendaalzheimer.org/files/galeria/files/zekowamefaboguludofa.pdf
    • http://planbmedia.hufiles/62121303805.pdf
    • https://imaggu.com/ci/userfiles/files/lotedif.pdf
    • http://fruitsad.pl/images/file/99945474231.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb070b90699---jowopate.pdf
    • http://akicgiyim.com/userfiles/file/92118826297.pdf
    • http://iviltra.lt/images/files/19146047547.pdf
    • http://spreewaldatelier.de/img/editor/file/75662276941.pdf
    • http://taxfreepoint.com/file/43974393652.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ga8milhvb9c63f6pl9q9t23q81/zuguvavizapepugobupiri.pdf
    • https://securityguardsupply.org/php/uploads/file/33208594700.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/347bdc71e363dbf822526f67b503b2a3/36830296743.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/9704dea8ebe8828ba53d4362c4741f62/nubigenuru.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/faf88faa616c4cf4936d113a3ef8886c/43803651737.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/f7808e40fbb36027f7c25d424a6fc24e/17522181013.pdf
    • http://christmaslandint.com/userfiles/mutapaz.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/67df98ea8e87bb1c98be7b0a6a65e116/27381763067.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210529111251.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ace3e30d6afaba797a0ab71ae2eddd9d/vuxozeladasuxexelijaliwir.pdf
    • http://decaldankinh.net/upload/files/tegaso.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821a3ca22e1---96484962581.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_off0000ef89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 16792 bytes
font_01_sfnt_off000107a0.bin
a1d50031c1c8bb4646d731c6b1dfa6bf342ca2b68a789ea63a5fc3a7940236d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 10800 bytes
font_02_sfnt_off0001204d.bin
c59f4f04b80c56243f5fd9a919a76629552b88c493e4fffc87ea67aab21a138a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1204D 18360 bytes