Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d85656f8e5ee18…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 14:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3a5cf6ad46b9096a472747db2155a595 SHA-1: 39d670e1b75c4f172e4cc3178725d89cf796fa04 SHA-256: f4d85656f8e5ee18cc3e711dd99e2305b4e65e66e621af80c5930ada66c3c44c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns, likely initiated via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://wastran.ru/uplcv?utm_term=student+centered+learning+definition+pdf PDF link annotation
    • https://galedo.cz/www/data/cms_files/files/74481496384.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/5366340093.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/nugemisufeveko.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/86759875623.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/48383734702.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/90b0ad82a0b2d9ffe7701f5d1df323b7/60843471703.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/74995301205.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/15426069263.pdfIn PDF document text
    • http://12shio5.com/contents//files/juselibakuzeg.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6520d80ea6---49660487905.pdfIn PDF document text
    • http://sro52.ru/uploads/files/gavifixi.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/64d14p502n2bnfqtvgpcei3r8m/78902981644.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/89655662629.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/ba6f8aa9e7c3c812563633b5a2840319/fajirimuxekizifaroteweni.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16080bd3c61369---ladagamozobabozidalir.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd554a9f0---lidutudumadap.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/ebd94649ebbbb434f8ecdf45b271d4d6/29995093575.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2f22a0beb---zekemifewutesawomu.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/gujijexakin.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/nejuzinutadojirusebogad.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/16160223525.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/if7plrjt062sq7tmlgp4pftu6f/kixitetewivulakojojamima.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/bezirurumesudebarexu.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/nefero.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/020547259104.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fece6cf797---guwetifasipepezakis.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_off0000d82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82D 16848 bytes
SHA-256: 4fcb3b0febfa103e0f5aa9f1bf75e8fd877ee78d58036eab208637684361885b
font_01_sfnt_off00010395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAC 10800 bytes
SHA-256: 806a07bb87d104ceb2a00b242b95899166029b9a61f72f79154f2a7dacd83954

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