Malicious PDF — malware analysis report

Static analysis result for SHA-256 901810c21af70f5f…

MALICIOUS

PDF

85.9 KB Created: 2021-07-02 04:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9b3e10c13145e3fbc9aa7d572d3403f0 SHA-1: b1f33446d9cdfa839f4dce0770ece6a921a66362 SHA-256: 901810c21af70f5f898653dee1b4e6e373bb736718d846574caa30f1a88e6a0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/6dec37027bb226c79fc2b12f6965b407/davetebidibazuwilovededo.pdf In PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a69718b225---4679669656.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/8c145c6e0f23a1f71f99a4f563696d84/36668409353.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854f1843df0---nazemiwitemije.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/50464857358.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/70154424218.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/543e8f6647b436e2bb06db428f37393e/bamirinoxiladadurafuxuge.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/64247019235.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4461305f98---73275931432.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-10/20210610115419589442.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/vibiwurepasenumudigezaka.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9r2elg2stk4o3emrpplque0sn4/nabaxitexemifosi.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/ec2ec2a8e164d0c72d632df72b958516/24338705891.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/cd14c50d33ab9232f77772241fc52936/vukoketagixuwapitigure.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6eca0076692239a91093d46a43bec1e3/11862002207.pdfIn PDF document text
    • http://zae.me/datafiles/file/17579705738.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/vezidufatu.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/zasolomododez.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac66c372c99---fitabow.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/61398059850.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/mobozawomolipuf.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ff6a97b32---69990928714.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/1781158041.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/qgqnrflu0rafctlqaiu28ql40e/ropufazigef.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7d89a1f716cf44bbee7065309f90b6de/tezugozevibolarotab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=irs+non+filing+formPDF 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_off0000edeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10602 10116 bytes
SHA-256: 1e28cfb9e24be882ed64d32689198248198bc122da54283a96c6e6b9e0198519
font_02_sfnt_off00011c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C72 17056 bytes
SHA-256: 77193a60125728d4333c78aa962f7ff754722495c7c67b1eb9ddf2141dd3a1de