Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ca2c41cf7b1e09…

MALICIOUS

PDF

93.5 KB Created: 2021-06-29 03:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cd4f0f8e1920ac91d1e224821523eae SHA-1: 1755e595a81ba496c669eb0664e2b13abe01f3dd SHA-256: d7ca2c41cf7b1e09201116f7a122a8162cc1f20ea73eccb56b96ac6dbb9a4c34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous URLs, many hosted on WordPress installations, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.deopendeur.org/imgUser/file/64774400503.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfcea26ceb---toziwud.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd96339d79---rizirukaxufaru.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762289aea5f---96602733585.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/3crq2p2jsku1hgqdph6k9vaped/kidisiradu.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/ef751584863b6ab3657cb0c9077c7c62/kefasesogesugalibogovuf.pdf
    • http://alnoorcity.com/userfiles/file/wologavap.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/c6275e436923b165aa61075d537651d4/6620989801.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e88e137d0---83641946686.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/m7mgrrjk0qc921gtisnssqf7c2/37186027330.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/5bi9rq66u0u8mthlu16jg7v2o2/29851212059.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/f1340328c49bc8cb4b990414a4d9baa0/50700920616.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e08101e387---86445221239.pdf
    • http://coffee33.ru/archive/file/jifoguvit.pdf
    • https://beautyyaurient.com/editor_upload/file/86368540742.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/50415820316.pdf
    • https://presentkompaniet.com/img/content/file/39045557258.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd87964422---raxuvizesosureve.pdf
    • http://myblindz.com/fck_user_files/file/14179063135.pdf
    • http://bawaconstructions.com/editorData/file/89070503311.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094adca9d61d---pidofoditebivip.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/3b2ppl51gg95t149kqg52q9i10/sogatu.pdf
    • https://shiokerbau1.com/contents//files/jamevomufabom.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+happens+if+you+leave+your+job+before+notice+period
    • 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_off00010c40.bin
afbbadd3acfbae77f0dac5aa7329f7e4984027cd693baacbc2a426810ed5f15c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 11260 bytes
font_01_sfnt_off0001266b.bin
efbb7ce378725c0e3424e0ab8a877f9c5c10f828202b882132633bb6db06306c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1266B 16260 bytes
font_02_sfnt_off0001507d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1507D 16792 bytes