Malicious PDF — malware analysis report

Static analysis result for SHA-256 0afc1c153260cd9b…

MALICIOUS

PDF

80.2 KB Created: 2021-06-27 03:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66d8b4880a253c72b10aefd08ddf2d17 SHA-1: d36dc6c9b6afb33ba8d53f03e13bf13011e4ad05 SHA-256: 0afc1c153260cd9b5b712e196796959250180d4094079c1e58fb762a4125341a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. It contains numerous external URIs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://medvor.ru/uplcv?utm_term=old+ladies+in+stockings+pics
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ac56d57a5---59555559427.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160909d3a94c1d---paduvozadapog.pdf
    • http://pospatrans.cz/UserFiles/File/timamigo.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160994c863b193---70004277578.pdf
    • http://axiomestates.com/userfiles/file/70672862842.pdf
    • http://aucoindeshalles.com/menu/file/zuxededimaretogarizawuk.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-5-15/20210515135550692053.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/6ldmbranh26s2udcvuee609525/83019051613.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/c8e0b49d7f0bd42fe972b240f3a2b5b3/moloninutesijukolow.pdf
    • http://anaminfo.com/attachfile/file/47440552918.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/916utj52q2p6ihhim3qnub3sg1/20783217200.pdf
    • http://web300k.com/upload/ck/files/kakipewojulomezewuges.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f050a7db98---99397363680.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ee56d0dd406e858d505cc31d1ccdd959/43084921051.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/nq2jos4qojtjcebbmn09k75n6n/wadijafeguxuwenapetozi.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa771043eea---jaxeganonegud.pdf
    • https://birudongker.com/contents//files/totegotegaruxadutafonu.pdf
    • https://saatyapi.com/upload/ckfinder/files/35948597933.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/3b8d70fee9611dfaebe5c3dfaf07864e/kozanizamutobuj.pdf
    • http://dianacb.cz/userfiles/file/rupufukutat.pdf
    • http://55thocscompany.com/clients/62662/File/91746620727.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeb7bbdc19---lodavetaxovitajezajulolan.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d1a7e27e8---gafutaj.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/262588928c7f5d4aad7e9915b12f9a43/37482895270.pdf
    • 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_off0000d5a1.bin
473a4e43d46aa20d21e94217760a32f0f0c24a796442b8cb322c62caa3d786cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A1 17324 bytes
font_01_sfnt_off000102f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102F2 16792 bytes
font_02_sfnt_off00011b09.bin
dbe0e88cfb3da75e4c326f25b96f603c7b1b57f1677494009b2190eac0ad7aa2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B09 10708 bytes