Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7afa3796b9f93c5…

MALICIOUS

PDF

86.0 KB Created: 2021-09-06 14:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 416a1a59be3fb5aadd80ed8415c2f904 SHA-1: e17d422eb320804457d0b950b958e04b68f27b88 SHA-256: c7afa3796b9f93c5ab94b88fb7e3d6f49f2c9d6508bfa684be1b0c9bfc8d2463
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a spearphishing attachment used to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://vishalahospitality.com/ckfinder/userfiles/files/39808500392.pdf In PDF document text
    • http://agataklimowska.pl/userfiles/file/wavalerexerejejaxebu.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/98114204628.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608b372cee6f4---nedotimubifegil.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/jofupudirozot.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f7cf10615---genidiwerukogadekef.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/kaxef.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/civ82j8ts4s5ujfsqofjvkhekd/62292896556.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/monisewobutipu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d60fe6341---laxiwojuremizipa.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/95341753843.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/54359560905.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607243f72094a---75062016776.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/xadorexovasijudurit.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5f065637f---jadasibopigaxibekidepas.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/jelinevakatodabag.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f32d674acc---82993516645.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/d8727041bc0cc96a48c9ecb064f0cb9e/2437821564.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/bi0gt109kgk3r9v4v0l2m0k304/21775526681.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/7108422416.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/08c6749d41c89374cb9b37f86f70f2cf/36442455608.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/93310101630.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109d74092133---dediler.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=part+of+speech+%E0%B8%84%E0%B8%B7%E0%B8%AD+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://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_off0000f011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 10476 bytes
SHA-256: 59d0d7f63607060ea541c59c8bdfa65eab503a55156353805940507765508e6d
font_02_sfnt_off00012020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12020 17736 bytes
SHA-256: 7f176d18ac017ad42ca381a65460c3c4a2c2da00c4fb9baaa4c3f74c77f3d10d

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