Malicious PDF — malware analysis report

Static analysis result for SHA-256 79be04c954efc85c…

MALICIOUS

PDF

87.0 KB Created: 2021-06-26 23:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f139662264f0124696b12d64d074163a SHA-1: a9e6a18e0140a8abd333e603acefafca16cb6a93 SHA-256: 79be04c954efc85c7eccf0156a31cb67279a2c2699283412b0a261df5e6597f8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the URL structure and heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://anpheatingandac.com/nbloom/fckuploads/file/nowejim.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lndr4nsa6k21c74quh1kovar4e/wawapibegikup.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8028ab4d5e---30194898680.pdf
    • http://moyamoya.center/images/hand_uploaded/files/61718596964.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080ec3e6fe4e---20767820232.pdf
    • http://exmar.it/foto_fck/file/75182774882.pdf
    • http://bean2beenefamilytree.com/clients/60578/File/talubojepowutixezodiw.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/bc8f169dc8c1e8cfb59e954cd736be20/55998809550.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16092ba0607e55---disozazupovamufevilewatig.pdf
    • http://maciejabramowicz.pl/upload/files/file/kezadu.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/46eefbe1e82a62772871d268567b7898/puweb.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ga3c8i0mgn0nlmg174d8jr82pm/88671861895.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/53811facffc0f787ff02a9b6f11427f5/wozalidinuwa.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48a13bf12---32416644338.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/5cbf07e93608f356ec42639821895058/nebilelurogamopuzozu.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a38dd0204---gakisegimafetibinuv.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c63fdca9a6---mefuxelarasitetud.pdf
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/6q5qeh87m1u4uncbj803t2u5jp/65946019917.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/d273d02f9ca06eba9752e88714843a42/82969751336.pdf
    • http://mytmbc.org/fckimage/file/59145651389.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe943813d3---jurix.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/ad29351e8820733a0cc2b1d0de7b14ae/75571176138.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/33onhivhrlt70n2n5ao1s92tp8/mamawogugolafox.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084e7d82ac05---lipebujo.pdf
    • https://tidurmalam.com/contents//files/wutixukefexoxowebamorake.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=federal+court+mediation
    • 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_off0000f36d.bin
8afaeac14e3f1a30dead05e5c3a397daf18969724c733f590b741d8da6da9e5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF36D 17212 bytes
font_01_sfnt_off00011f4f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4F 16792 bytes
font_02_sfnt_off00013766.bin
db81e469121bf0d829252a056eeaec99efec7fef7f673c81e6301f45d2f64bd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13766 10440 bytes

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