Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d71ca2afe7c4cbe…

MALICIOUS

PDF

89.3 KB Created: 2021-08-11 02:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9179495d2139b0cec653de5dfc9a3c6b SHA-1: 8496d2f064a68e1ffdeee014dabd404a000101a5 SHA-256: 4d71ca2afe7c4cbe4fa7f94aee47eebda46e9e479a6412db2ac8a88d1730c163
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, indicating a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host and link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://promobryansk.ru/userfiles/files/dunevogigavezazevosokipu.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a098ac2d021---nixetiwikuzebaxunaxikulon.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf09f56663---79518762285.pdf
    • http://traiteur-ribot.fr/userfiles/file/71157887240.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160772186d4ad2---beziwovawinivavakekuzegu.pdf
    • https://divinenine.net/userfiles/file/70017723917.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fb4b2ca1810---41569748055.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ugh4635vf255n6do1ao2tid5o/sijekimobitov.pdf
    • http://diversecityuk.com/userfiles/file/sijiwu.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608124fcb9712---tixewip.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4af1f043a---gekodef.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd3ed2444c---25287496241.pdf
    • https://motacademy.it/file/goxepaw.pdf
    • https://tekmaker.com/upload/files/51991620558.pdf
    • http://yishiweb.com/upfiles/files/20210620_045429.pdf
    • http://hzkontejnery.cz/ckfinder/userfiles/files/12213014645.pdf
    • http://brunsfamilyreunion.org/clients/e/e7/e70b0594429ddd28dfd4dd2f61c76e80/File/nevakaletugadadeni.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d09217e0---81047178799.pdf
    • http://keramann.ru/uploads/files/xijatafaw.pdf
    • https://betenenergy.com/sites/default/files/file/nupite.pdf
    • http://le383.com/uploads/files/gifuvusozura.pdf
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/62544977362.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/o87qf538fvjb2opm52njp2c4a0/kotokef.pdf
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/lafuso.pdf
    • https://almuhja.net/ckfinder/userfiles/files/solupupuresovabeso.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a570a52202---39312868658.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+see+images+in+yahoo+mail
    • 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_off0000f951.bin
b8018aafa67dc5d93280b98732a4db8dba0f4d348060c0501e4916cad5cb6ffa
pdf-font-stream PDF embedded font (sfnt) at offset 0xF951 10648 bytes
font_01_sfnt_off00011186.bin
18ae0772ab53c4cd082bbdb9550205be764d8f3c05bbca3bd735494de3360bab
pdf-font-stream PDF embedded font (sfnt) at offset 0x11186 17476 bytes
font_02_sfnt_off00013f4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4B 16792 bytes