Malicious PDF — malware analysis report

Static analysis result for SHA-256 687ee8f460a54b15…

MALICIOUS

PDF

83.1 KB Created: 2021-08-21 10:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c555bf507a0ebf8e0b630a0c641e4cae SHA-1: 2052abfd90e0f054aa454fbfe11283e693e35a7d SHA-256: 687ee8f460a54b1522070dc70d8df7803a426f15fd12e09f2e09227ba844fd24
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised or disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and numerous external links suggest it is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://braintreeclinics.com/app/webroot/img/files/bifirusoximetag.pdf In PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/1rikara5bfcc8n17p95te4e6gn/79142710169.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021060708382083.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a1bee7cb751df184f746c11e7ab0401/lusopobu.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074fe5eb4b2f---kejesis.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608704e951498---jujonunokepasijifenida.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c5fe09f78---87056342842.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c66bb94b2e---ritirebedevexularuxuta.pdfIn PDF document text
    • http://freetds.net/userfiles/file/94386602161.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210814015508.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/joredarono.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/2389441313.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/66793ddfe0dc56fcffdb3b4e6398ad4f/xogorebevumixigiminuvew.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b566d1a40c3---35799956156.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/3442956900.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/wekufimewelononode.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/51481522275.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a997293298b---1859771472.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/pudavedosobeba.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/rexakunupazugowobulozavaf.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/rt0h5ov858oqrvfei3gh8ed427/77438744467.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/68751702302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=indefinite+integration+problems+with+solutions+pdfPDF 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_off0000e0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 11220 bytes
SHA-256: 2886b4b4da96acc233a9eb7107c96c88b49f7a4efed3c68b7bea0e23adeba713
font_01_sfnt_off0000fa87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11299 16828 bytes
SHA-256: 842eb77a293dd503a947da05d45b243b0e4e9935c1b63a56c17809bd40032796

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