Malicious PDF — malware analysis report

Static analysis result for SHA-256 1597fda73965d1e0…

MALICIOUS

PDF

82.0 KB Created: 2021-08-23 19:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 60c1592148e224d0794eb783f4ffbd29 SHA-1: 05a0ac2d5256f36ded2e89c888f597a57137a72d SHA-256: 1597fda73965d1e0097c00242f40746d89f28adbb6d357d34db6038af424b1f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

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 http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/deboratadeluw.pdf In PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78888935961.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4db71dbf7---jilawatexikokig.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/katamejezivopudibelejolo.pdfIn PDF document text
    • https://strechybenesov.cz/content/bulafop.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/ripigowigumifokugitafob.pdfIn PDF document text
    • https://irantruck.ir/data/file/bapasizuvigavupironajeni.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/dovadofenedo.pdfIn PDF document text
    • http://chinazzjx.com/d/files/kasodavegu.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/e76e596730bba43bb16841de4624b38a/bopel.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/5607247449.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/71716999430.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f6e98c94ca0ffa9f5bd77a587134e571/rezunotimuda.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/5dgbt0d91m4p36m90nhhlhcl2d/mewugado.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/neloziwiminakenakalagu.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/wotirilumuwiz.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210621085857.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160f1187809c0e---fezawolapejuzijopatudisom.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aac0cb8448b---69502236182.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/92330231583.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/35848818917.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e9b66b6c6---99792664249.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/502a4a0fd5aa30f0f848a1be30da8cbb/90070228702.pdfIn PDF document text
    • http://clingac.com/d/files/72523460136.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/zisadam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=electrochemical+cell+batteryPDF link annotation
    • 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_off0000df70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF70 16536 bytes
SHA-256: 8662d0a2f1fb9ea836f87222cda3a2fa297aff46a10ae80fc5f433357603cf07
font_01_sfnt_off00010a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A66 10460 bytes
SHA-256: 7e819db30c05f8011bad3cf2edf437a0959bab763c27c8c8b9548902c251a44c
font_02_sfnt_off00012223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1