Malicious PDF — malware analysis report

Static analysis result for SHA-256 644c79d0127897b0…

MALICIOUS

PDF

86.2 KB Created: 2021-06-30 12:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 23996b4ddc66683681659f74925542c9 SHA-1: 57e364403da4cfadfa5403f4c105417d6779999c SHA-256: 644c79d0127897b0245bf942732f179ad1d5fd916955f1e99073a139dfd4d0d4
176 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to compromised websites, including those hosted on disposable domains and using common CMS upload vulnerabilities. The presence of a raw IP address in one of the URIs further indicates malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f44cd778762d90f2b9758f7a65cd569d/78594333273.pdf In PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/612e0f3e91bccefe1624a2553682d28c/69008616150.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d00e3e5ef8---28615581645.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/vovitegatuzusunazatasuvof.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/momawurasaluzaremotasiduj.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f820e67860---tukigisifa.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/bubosoxogoz.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/bdc2aff8d5d207466032c834132afc36/pumugelujalo.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160731bb33014a---7200480866.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/gkj9rt4e51t4590s25mfa4ii00/44243708362.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdfe51fde4---mamovasanenuv.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eda9c1d399---7499982011.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/83856916344.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/tajawamadivesarax.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b98648372b---57245489693.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/62418520698.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/nudonanopositosagusezuxo.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/lisirito.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210501191712.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/gewetizukowupivotezaxu.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/50fb402341c7af77db3b0f8a1fdaf4bc/vadezigenud.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b186be60915---xitaderev.pdfPDF link annotation
    • https://myphi.biz/nbloom/fckuploads/file/12311241439.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/b1beiujke729v5m8j1bc5f73n4/85547300941.pdfIn PDF document text
    • http://dentherapia.hu/files/file/gixejifodoxupisajujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=can+geese+eat+popcornPDF 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_off0000f136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10948 16472 bytes
SHA-256: 339907de59cc10236296c7abe778548f9b868cfaef476b318304359696f400ce
font_02_sfnt_off000133e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E6 10440 bytes
SHA-256: b3f0c49d2f45439e163b03e45d73004cb16ea5e702fe1f515f14fc11e04924dd