Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17ac3dbbe112918…

MALICIOUS

PDF

100.8 KB Created: 2021-07-05 08:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 873e5735372825956a567d4e343ab9cf SHA-1: d0db1685f4ab7fdcc00dd66acbcfb48fdb7f3375 SHA-256: b17ac3dbbe11291836bf6deb61bb89859d2a178d5a69360b5a9729730530d632
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The file contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 https://queure.ru/uplcv?utm_term=meaning+of+kaolin PDF link annotation
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160d3dcc61ce5b---xubomumeketodorop.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b54254c0e2f---xobiwarov.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095abebbea33---rawetolunoxapabin.pdfIn PDF document text
    • http://stroi-sistema.ru/img/39149474992.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160950e3887ede---jikedid.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/degivusevujosisode.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/94763249443.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1607a79c1b74e9---67286675257.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/e44c196eb900f88f2038017111cf2abe/pabazizuwoxurimonodi.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/13614832021.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/dizatavagosevulafo.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/60abac441c00c1d9a4b1ddd84aaa68d7/24082136320.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/oujgc2c5kqvc127f1vfvqodmki/wozufagejujilij.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/uaeb9ngmolc7takic3qin5l7s0/23979825661.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c291b741f0c---jefifosimerotefixifulij.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/d1g3gran0fvlih6074g8ocfp53/doxuxurukisuwuzifax.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210522070755_hrwyen.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/fubatejudalazokejazimil.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac29f2371e7---19398560401.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/bbcc79f76e421ea93987113a8a704975/beguj.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cd9297ae7---zifusir.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/90ed7dc5b5e2e3b4d496293034866084/55000676056.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5420a437a---malofew.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bed3e9743---zasarupoforikonodegum.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbcdfc7e52---kipokarokuwew.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_off00012561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12561 18380 bytes
SHA-256: a284c48a238b799a44cc4469026ad60d082527486347d710229f48827a82cc69
font_01_sfnt_off000155bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155BC 10108 bytes
SHA-256: 6734afd16062df4f76f5903dbf1ace797111d199dc11bc83dd4a91daa1f2c9e6
font_02_sfnt_off00016c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1