Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88372a8591d68ab…

MALICIOUS

PDF

99.5 KB Created: 2021-09-08 03:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6bde424624cc8ce732d201ea72874761 SHA-1: 17f5166f11f15929fe7f2b28a7c29f46c03a6380 SHA-256: e88372a8591d68ab936646422563c54b47987cab934dd33fca37d9707462f1af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous URLs pointing to compromised websites and link farms, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links indicate a phishing or malware distribution vector, likely leveraging a compromised CMS upload functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=rosetta+stone+english+american+level+3+pdf PDF link annotation
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113ac3b481bf---nexug.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/25603234898.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/61956226943.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8p0s9g35vv7ii1kf71ip8c6kl/68283073104.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/lowujasezif.pdfIn PDF document text
    • http://fgosvo.ru/files/files/mazidevud.pdfIn PDF document text
    • https://506hlapeta.com/files/file/lajilewivafizibuboxofowaz.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/nefazunito.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/nezetijigimopip.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/88970595564.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/60782530506.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094763eb4a2e---29467758662.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f69b651694---wonitesewininof.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098326ce830e---43648914076.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/wifapubemeve.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/21569842145.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/mavirukonipibef.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/e99a04782668d93832b16d50c88a8885/48553389607.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e51780ebd---47364082337.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f967936f42---9041137254.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/48926686079.pdfIn PDF document text
    • http://hkalc.com/userfiles/20763134791.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_off00011c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C74 18828 bytes
SHA-256: 515b921b08d5f78310a24e9a14c7d4648f76d7a7760e15caece172ec5820e23b
font_01_sfnt_off00014de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000165fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165FD 11348 bytes
SHA-256: 57dc2a0de344aa675b3896ae86bce06b2804d7a0e758c03476312433a706d617

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