Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b97a6a75ea004d…

MALICIOUS

PDF

96.9 KB Created: 2021-06-29 14:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e930b6366a4ebc99c5744ad649189043 SHA-1: a306eabeb29843502d8b5a707416f7599b14c0f4 SHA-256: 07b97a6a75ea004da006d79220864aa50d857a7e7a740d0e1ab9504d1678cfcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics suggest it is designed to exploit user trust by masquerading as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://laborke.ru/uplcv?utm_term=angiography+report+pdf PDF link annotation
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/j48vvd9ttjtem6qa3761ckihh2/sepedazajavamekaxeviwisi.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b741677932d---18710650483.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/69739899817.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/688e3a024c06089b456481b85adf429d/23472769361.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915b699cb27---19906763957.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8df44cdba---20174459066.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a35c5efdd5---7844021908.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086c879ecb79---34405010541.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a89115d07f6---56690184473.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7b536e665---wamagefazukagekiza.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/df5c43d365ef5a149593b2d6e0f6bb59/15869778424.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/64aa1c9a0c9af6d49b5484765851c97e/dixobiwudul.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/ragibejixameturexotes.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/deed6676bd4b11c477e12b58e16c0382/30669411839.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/eq831jj1rti9dka3a05dns2fg2/42073152385.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07f7b61ecb---pufedizibojovumadefexel.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/zupekogodobusaxugaguw.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b61d9db877c---52725914681.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/fuwitox.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b3375ff15---48819881254.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/jasowudi.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210624_8F3FA67379C77FED.pdfIn PDF document text
    • https://bnovum.hu/downloads/sokirimunobadewo.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_off000119a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A0 17096 bytes
SHA-256: ac9d354852cc9bb69a1b7cf7e5cf9506dc3b56b07282bf9d752570c76a730af5
font_01_sfnt_off0001464e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1464E 10660 bytes
SHA-256: 48bfb98c1ccd98a50a66bd539ee29c592779914fff8984f731ffc812a50baf90
font_02_sfnt_off00015e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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