Malicious PDF — malware analysis report

Static analysis result for SHA-256 681411b99371f3eb…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 19:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7c0054ae4ba34877c1630c90608037e SHA-1: 8b0eb4c4ef4013a925c821753abd211315f3fffa SHA-256: 681411b99371f3eb0cb862905bcda3ac0c28e2e98875f2fafe4dacd78c21841e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous external URIs and the nature of the heuristic firings point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/wakomavazopusavodasuko.pdf
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/13cf51cf996bb1835c11aded1097de73/pisadatavoturutixuda.pdf
    • https://egyptsuntours.com/userfiles/files/10925635343.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/d2068d2793822734d21a5f59e6d38e93/35246546262.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a031161e141---18996212550.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/2914cba688a34e2cef4470b8da6c69de/26052087925.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/blndnn8c8cncvdll7pjg4i9oua/ropavu.pdf
    • http://skomi.ru/img/files/file/28698864142.pdf
    • http://avsa.org/sites/default/files/images/files/puxutikokosalewolowuke.pdf
    • http://www.urbanwaterways.info/files/roxopozinavuvavose.pdf
    • http://nordavril.com/userfiles/file/wumabimi.pdf
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/81997862580.pdf
    • http://sladkiy-ostrov.ru/userfiles/files/tenulinonusegaxobuxesufel.pdf
    • https://keluargamimpi2.com/contents//files/28472041914.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/f583e8a60b3439c04837890bbaaa865e/dagokikegaxe.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611cd14a8e578---95725699442.pdf
    • http://petukmahaaaraj.com/userfiles/file/werujolegajezimetimivulel.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/b267ba7e38fdfdb22af2c76db404e803/72180022972.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e8951fcfd---97239951269.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ue25t15s2qf4dku3ka0c847i42/rupowabakaritoneb.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/jl8vbi2hhphmf6bhp8k78pfd2b/50483782101.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/b16f13831a77fa2308f83a925c60fc53/24052132202.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/35d1b38c1f3d3ecaaf98d0310279921a/zakejof.pdf
    • https://regiefranchet.fr/userfiles/files/366363771.pdf
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/71502149673.pdf
    • http://neonyazilim.com/images/Media/files/20385286004.pdf
    • http://ji-tien.com/userfiles/file/peterowifibi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pdf+professional+free+download+for+windows+7+32+bit
    • 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_off0000e198.bin
a766c644b2401179b205c4df47bf1c7a566e10a631848ad34da8b01f3b3f463c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE198 16948 bytes
font_01_sfnt_off00010ca3.bin
a02bcd0932bcd445661ca90e2b61c24e41fb0b764d22f2862d10ccf75642335a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 11060 bytes
font_02_sfnt_off00012672.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12672 16792 bytes