Malicious PDF — malware analysis report

Static analysis result for SHA-256 073af3ac3b3eb584…

MALICIOUS

PDF

76.7 KB Created: 2021-07-13 16:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66450c1b51d75e2fd9aeb9056eb21bb5 SHA-1: e1bceb8adc40ea7823a1ea9310dee955575dcf6e SHA-256: 073af3ac3b3eb58435edcc9688b4d91b9d80e65f96c7aeedc5884d42d07dbaf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable domains, likely for further exploitation. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/vewujopoke.pdf
    • http://solee56.com/ckfinder/userfiles/files/21826497186.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075539f3f5cb---xezerira.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5ed9bd0998cf5fbef3c12b6b6a90bf78/tajorelarizi.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d28e88954---zilodulisiveposilesibato.pdf
    • http://work4shop.cz/userfiles/file/99385977586.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/o5r6iegu5hal4e4l3si67gbhft/fexokize.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c377eb1ed1d---85799201225.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6dbc188fa---misovakasemojatepamabune.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/53c5537c0d0a1f48707f8ee6ed1f5806/fuzawokivipatijukuzufi.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/c00d4a08d473dba94b4aaacdeb737c2a/firajuvidanufoxe.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/5c58ee4eb575cb81ef49c59d6bf0621f/84748714568.pdf
    • https://namlongadc.com/uploads/news/files/56518968321.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1cd6ac32d---9119876397.pdf
    • http://kiiga.ru/userfiles/file/vujuviwonomedupiba.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/c4fteak4lvc2slfgeb8uhtgp3m/fenuguribuxeraku.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/bhgjo12jg93ps92309qnot2hu1/gifavavexukupow.pdf
    • https://luyenthitoeic.info/userfiles/file/312309539.pdf
    • http://aldo-ins.com/userfiles/file/ruvatixipovaf.pdf
    • http://aceonlinementors.com/userfiles/file/12712763259.pdf
    • https://simon-daulte.com/ckfinder/userfiles/files/zeluvalegilur.pdf
    • https://alshamiltrading.com/alshamilfiles/file/fiberikibikajezibiziloz.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/0e57d6fff6579fe1a544288ae6d67515/60182554827.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=two+t+test
    • 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_off0000cd06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD06 16792 bytes
font_01_sfnt_off0000e518.bin
7f5bb44810359068d1129b18d5f38c6bb60c190af2b4da8c61aeefaf2014e413
pdf-font-stream PDF embedded font (sfnt) at offset 0xE518 16796 bytes
font_02_sfnt_off000110e7.bin
c7cb0f62e14215a93331b91bead44825538a4f1e37e7c6c06672a178291494e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x110E7 9648 bytes