Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf93957c888b2d3…

MALICIOUS

PDF

86.1 KB Created: 2021-06-28 18:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 402d2cceeea0fb7146535d4057db8d30 SHA-1: 74d3d2217e08b01d9cc833e735e39dd63cfe879d SHA-256: fdf93957c888b2d36e937b02f1624def528022ddf80d0f25445bc84bd46395f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, likely serving as a distribution point for further malicious content. The primary attack pattern involves luring users to click on these links, which then likely lead to malicious PDFs or other payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/4c4059168030413ff96f8861f5270bbc/83432462036.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/k4q5avrp9fc54dtu8pc10tsa9c/vononuvupesozeza.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd89dbcd74---pafopubifebufevubit.pdf
    • http://sns-russia.ru/userfiles/file/91597073324.pdf
    • http://vidol.nl/userfiles/file/metidoralopasobebo.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160859a30883a3---8402929258.pdf
    • https://kodcomputers.ro/2664/uploads/57695890986.pdf
    • http://alpha-th.com/userfiles/file/26028855049.pdf
    • http://ahkjt.com/upfile/file/94178812536.pdf
    • http://dongphuctqueen.com/upload/files/498442023.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609037d478339---woxotafopoju.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c5dc57b1f70bd6df59beb8af275be0fd/jevepitusaxawoxape.pdf
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/zumesagozi.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079bc60734a4---94378785939.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a4183f05c---73101972302.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609feffb419fa---pover.pdf
    • http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/nokowaralobapisovoto.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/0fbkd6i509tldt789pkksrte2q/xowotiwozo.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad90c5b7633---bupuxaruvurulavitoxeviwi.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a860d29855---75323190843.pdf
    • http://mevlanaasm.com/resimler/files/52351977984.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a29273b5630---76031528099.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a4874c03b---34210773760.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=if+i+eat+700+calories+a+day
    • 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_off0000ed1e.bin
044ae4105b83b395e4c21afc6b5198cb71e3e66c2dd44e7d531ed4b4935ef1c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xED1E 17468 bytes
font_01_sfnt_off00011aae.bin
a73f69f8fdc4116bdb93cbc750e299631787c8ed22b19c2ab1ee655aba153441
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 10600 bytes
font_02_sfnt_off0001331e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1331E 16792 bytes