Malicious PDF — malware analysis report

Static analysis result for SHA-256 a618994e5208e4cd…

MALICIOUS

PDF

92.1 KB Created: 2021-07-04 03:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c741d2495b8fe88696ba3674fdcc4332 SHA-1: 412bfe66bae89c9608cf8373a36aea0a2e1a0632 SHA-256: a618994e5208e4cd8ed7c8cda48c14b455f0b1bd1ded73158a826ef3b25df2f1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on potentially compromised sites suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://ketchas.ru/uplcv?utm_term=meaning+of+discernment+in+the+bible PDF link annotation
    • https://aslimitada.com/userfiles/file/9395809793.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/61155371355.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0de1d6fde---gazotezaresorij.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608b61d4d53e6---lojakunaxave.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/47419718201.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1c3e332c4.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c33c3ca795---48864297192.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/crf9rqnfc257tq2l0p6ue9umc0/79818225075.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/oo7urje496pmski4kp985d4j6e/56629802126.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/7537447f0ae690b797b07af4c5117c31/kotuzatexotukedokuzoxig.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/77548712293.pdfIn PDF document text
    • http://northcity.rs/slike/files/1660319834.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/posazojelevutuful.pdfIn PDF document text
    • https://tantecoccole016.it/file/79427281121.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/50175475795.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///dufuvulovuxitikeparujud.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b50e6be8cd9---rowes.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c579405c85a---83040897415.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/90320203132.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/kulanamuzaguzupuxita.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607185c03ec12---mukegokowefedusumevosod.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740319aabd5---tozatojotawuronubem.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/4c764c3927ddb8a4ba34f3e6d263190c/didejosuwemusisoni.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nonaxomi.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3829181169---53005740939.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_off00010476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C88 17372 bytes
SHA-256: 54cee8dcaa6de53a5a83f3098be00a6f99390a22f4df7a9a16f4f292cc8f5f0d
font_02_sfnt_off000149c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C6 11056 bytes
SHA-256: 1362c14602cc474ee2968883ba841a78312c4cb411109dee680116bad94724ea

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