Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc65679443eb857a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 18:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 26ad59f17ceb5357881f726564737c08 SHA-1: c1a8ac66b18369e0327bbabe857dc7f02f4b623a SHA-256: cc65679443eb857a441fa4bed4f3e622a6d08750689783e1ee69fde58ea849b7
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised WordPress upload directories or disposable hosting. The document body is heavily obfuscated and appears to be non-readable content, suggesting its primary purpose is to host these malicious links rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348fa1c4e90---69523422192.pdf In PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/saxabagozeba.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210901075705_904477154.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/44279967965.pdfIn PDF document text
    • http://ladna.pl/user_images/file/32516558143.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/wuvudiwodo.pdfIn PDF document text
    • http://abnicum.ru/files/file/babidasunosotuwezu.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/29183305270.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/19049606054.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/kikajirakatafumobaxi.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/86444098510.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/nusasome.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/mizalitusujebafedijaruso.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/95559473239.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/26053gombin98i8pt9lubqbas3/36437379344.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/saranoxekejakarinut.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/qars6poht9702tvedl66pt1rtn/67403484742.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/xijotin.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/dafatowaxusow.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/bigizibobipobeloxiwadoru.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/8144932666.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/68174756164.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/58398541504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=paranoid+personality+disorder+medicationPDF 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_off0000daf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF0 10788 bytes
SHA-256: 684aaeee202067ace280cccb32166cfdc7190d8d616237f3ad71d040173265af
font_01_sfnt_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 17184 bytes
SHA-256: aedd37968991341807fa3a73943b55d382b1f7c22f93aae0f98a72d3064d6a29
font_02_sfnt_off0001202f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1