Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6100b9c672c265…

MALICIOUS

PDF

102.0 KB Created: 2021-08-11 10:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b771fee4bd49680d08c0b05c3d0d8a72 SHA-1: a629cebb47fb454f1b3dac55441edac2884cf0b4 SHA-256: dd6100b9c672c26522dc719d255ea4799b6afda954667d36b434988422bdf37f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous external URLs were embedded, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body was heavily obfuscated and unreadable, but the presence of external links and the high heuristic scores strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://pistant.ru/uplcv?utm_term=evaluation+cm2+geographie+se+deplacer+en+ville PDF link annotation
    • https://castilloexterior.org/ckfinder/userfiles/files/55275894047.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/42e067645bf0f769a8237760ae880622/73135212342.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/98355857611.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/gerupulagekufubulugub.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/40237657863.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161038e4476316---zutab.pdfIn PDF document text
    • http://mobilenmr.com/files/files/97646221932.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/wobokuwokiji.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c9076203af2---dakenajefinadupam.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/01aa1dfbc8e751a70664bec90f3c1442/wedolamukovazokawusapez.pdfIn PDF document text
    • http://expresskaliski.info/file/8512228883.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/93809390308.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/14e7d484e3325e4239e0484805572e4f/lulonopukutewebebepevegit.pdfIn PDF document text
    • http://grotech.in/userfiles/file/95112289396.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/25810943878.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/b56a7c9568d67ad8768dcdf3d5fe3a58/fulovajibizejuluruvu.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/49495760046.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/vakegag1sg9kt32mukksplefr6/webajoravemeguvus.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/8s6vsluodlkic1qn1v9ktf2o17/8768131576.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/53629288514.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/fubiwajalumiganogiviketo.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4de2653d8---woxisokowebes.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/2gkia6g804j7rt46b1bvk9ebns/11118433961.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/57088025206.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5D 11228 bytes
SHA-256: 04b94ecd931ed9b3e5c20f4f00cff4fb86ebb98a88636afe3866846165c7449b
font_01_sfnt_off00012656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12656 20136 bytes
SHA-256: 9511355b685fb32ed09e013fe24b8cc182295e5764c10d4ebcbeabb8e721e6c2
font_02_sfnt_off000158db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158DB 16084 bytes
SHA-256: 629677e45faedee601e08dfe5d93bed8cb2cbab2933fb40e48fc5543807047de
font_03_sfnt_off00016e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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