Malicious PDF — malware analysis report

Static analysis result for SHA-256 898b01b9583fb4fe…

MALICIOUS

PDF

88.3 KB Created: 2021-06-29 11:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37244de31ae80427bd0118097022d53a SHA-1: 06b2add169dcd1c2e1184d231218163f6f86dd9c SHA-256: 898b01b9583fb4fe03b53cf519001d8dac1a7348d6f6cbf24ce5078692960180
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 identifying it as a phishing trojan. The document contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to distribute malicious content or facilitate phishing. While no scripts were explicitly extracted, the nature of the link farm and the detection indicate a likely intent to redirect users to harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://laborke.ru/uplcv?utm_term=how+to+invite+someone+to+your+island+in+hypixel+skyblock
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad94f83e1b5---27230499250.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ng1dio4fv3ns3o2gchisg6jufd/makarawexevuvanagemajalit.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0426878d6---dupuzabakobamogozumer.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0de080dec---50358612890.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/f8ca3b8b5135fe074ef9c6953193bf92/pejaso.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160777cbc2d828---63906151088.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bcfbd3cc0---lagipujarojegeledefor.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dc507eec7---94122115209.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/dksnkoa33rbsq383n8f5mdhnrj/voxel.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/54492c3d1ca5df866df6435b2adaa1be/12270392736.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39422ae948---risejuremikogapesomu.pdf
    • http://unseretochter.ch/images/file/lugopabin.pdf
    • https://eurouniversal.eu/ckfinder/userfiles/files/jalefajusanudetole.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c729cc43b39---powower.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e15013c98e---96846481380.pdf
    • http://bean2beenefamilytree.com/clients/60578/File/davowow.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/7f7r3av40oul4mqtat4udq5npl/54525347377.pdf
    • http://www.companyforte.com/imagenes/editor/file/51608865856.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/na3amfdbqrrp3f94l9e31j2kc8/5960323648.pdf
    • http://stark-tools.ru/images/uploaded/29665822924.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/k86k5m5ci8pujs8glh789dsta5/nusoxojigowufasipipuwup.pdf
    • http://allg-gyn.ch/userfiles/file/sasokadijuvoderisebu.pdf
    • http://matsonconstruction.net/userfiles/file/15757175794.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_off0000f07d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 16792 bytes
font_01_sfnt_off00010894.bin
10c2a4f679aad7837f0832fea276bd51c27fd1944780dae6f2a52592123471f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10894 11472 bytes
font_02_sfnt_off00012351.bin
132679309110167cf4e634931e1591c8ee478010ad1c2778ffcb460b44edbc9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12351 17700 bytes