Malicious PDF — malware analysis report

Static analysis result for SHA-256 c977278b1632422b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 02:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e8013aa4680f42b23ce95dfa502994d3 SHA-1: 7c1ca18d9e6c7129154f9453d904cf50a0b9d020 SHA-256: c977278b1632422b16273566ff04aa14e7de83f1ac65787d9b44779c95d3dfcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The file's structure and the presence of external URIs indicate it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://crysiq.ru/uplcv?utm_term=how+to+take+a+20+minute+nap PDF link annotation
    • http://al-bandak.com/userfiles/file/mogusivitalixumivafab.pdfIn PDF document text
    • http://packturf.fr/files/32767871770.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/45258368692.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/t6klpvpbf56ofcmk1r6l14ankc/terufibowuzax.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e1c15fcdb5e---pomelokufiliweritaraz.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7483e9b428---34456581407.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cbbc877e3---54559155850.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2e18b0291531e854c4e9a6c09e9b660c/652611241.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/35226344586.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/joxeruziliwukaxot.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/kewaf.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/23075441802.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff7a437832---76886403964.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612378a7975b2---3860963568.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/87784904061.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/73746012180.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728e4caa1ea---nemukabusovafasoz.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/89168915114.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/95796030899.pdfIn PDF document text
    • http://hpmcfamilyreunion1968.com/clients/83891/File/bewufimerutipiti.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/90893361285.pdfIn PDF document text
    • http://tencanpowder.com/d/files/nizumu.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/rufewatogoje.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/6ds9uaaqmbfoekug0pa2tkuhp6/gilojegu.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/15305443825.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/jobiduwobolurenezosa.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/xedepuvowimugelapozakofu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09B 10612 bytes
SHA-256: d234da0695085c88bc747a3bf83e22e444b8c369470befe368610111f119591a
font_01_sfnt_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F6 16976 bytes
SHA-256: 60c4786423b497fedc7043106151910490f733cb24382d0bb49441b745caf15f

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