Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b8313ac4bfe8ed…

MALICIOUS

PDF

83.4 KB Created: 2021-09-09 08:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 97f396d6a52e0cb6b5f7018c0b5cfd35 SHA-1: 496da2a101fc15855be52a0e9ac7ed103ed69951 SHA-256: 22b8313ac4bfe8ed568e59ad1eef34ddd23afe3fce0a3cd1c5d5992eac814a19
104 Risk Score

Malware Insights

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

The PDF contains a link farm heuristic, indicating it is designed to host or redirect to multiple external resources. Several URLs point to compromised CMS upload directories or disposable hosting, suggesting a malicious intent to distribute further payloads or engage in SEO abuse. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.findvoters.com/userfiles/file/27640794124.pdf In PDF document text
    • https://sskundal.com/userfiles/file/misavovufefejirufatore.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/51140974385.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/losoxikudelipirisavose.pdfIn PDF document text
    • http://ducnhua.com/upload/files/97629712248.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vituvanifabixupanitix.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/zatamabuvumugewojuzitez.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/nofoxomukakeguput.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tenabok.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/artcano0jrvik33ai63gdmdfnq/tateroxedusudujanetew.pdfIn PDF document text
    • http://ailizia.com/userfiles/43468363564.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16138325682ce0---43810392160.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/88649240226.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/44e8d7cc28bb43790608f2502bf50d5e/latenurudulowun.pdfIn PDF document text
    • http://analhospital.net/file/files/madodupi.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/30967728919.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/xiguzerumajekojusef.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/80403037304.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/kizodepupisugelaweg.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/76367559405.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/sewefodikejukerewozaje.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/riwarupegilijotunogod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=psn+code+generator+apkPDF 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_off0000dfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA2 18508 bytes
SHA-256: 16393e84026a52b60f08f9b60bb50da61278aa0f3551d04f3a577de47e2406ab
font_01_sfnt_off00010fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FC 10644 bytes
SHA-256: 5325176671abba190a83a33d964382bc948b6bfa0746cfe612a9c02de26e4512