Malicious PDF — malware analysis report

Static analysis result for SHA-256 6940b1301cad140a…

MALICIOUS

PDF

84.7 KB Created: 2021-07-01 12:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08fdc8b6c79e62bdb8b9f281c20bbd50 SHA-1: 18afb202cec07ef6722799be3c6f8dceba3d7b96 SHA-256: 6940b1301cad140a55acdfa82f80f3f6b278a85daae9deadbea76304590e2e05
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to potentially harmful external websites via these embedded links.

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://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070dcac54058---40656893428.pdf
    • http://ansonseatery.com/uploads/files/wugusitalinuvominoxan.pdf
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/33516393035.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608808e22f31d---45077960487.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba55b3179b3---36975865863.pdf
    • http://matstravel.ru/userfiles/file/jijizip.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/22844071696.pdf
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/babafexu.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/n6ks25u4k5l02g7o7jd45ker2h/73233027797.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac936cf490---veluremorodisimubib.pdf
    • http://www.bandungmesin.com/file/foxakiguvotegevolusilafil.pdf
    • http://beamstraffic.ae/amb/userfiles/file/29846186534.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160afc28e8531e---22784595089.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba33308ef82---77829812156.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5df46d344---vetobi.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c00aae7003---53615738084.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/50f39f3e87c88de84c2cbb3737bd1cdc/biwawokubexiref.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/d1045b9ffb54457c22ef5d5f46e23968/55219961839.pdf
    • https://bushregenerators.biz/userfiles/files/71770860394.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84a443532---85878482422.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5c67696a4---fejapifaliku.pdf
    • https://cornerstonelaw.eu/userfiles//file/53708199528.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=marquee+marriage+hall
    • 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_off0000e946.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 16792 bytes
font_01_sfnt_off0001015d.bin
c89a173897654fb3ff3eb60bc11eaf216a763700307f796c27e53fa90ae833dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1015D 10304 bytes
font_02_sfnt_off00011822.bin
c4f1beee659ce8af2fede004ef4945e88fbd841ef34fbd5b255bb841a05dbffe
pdf-font-stream PDF embedded font (sfnt) at offset 0x11822 17108 bytes