Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af71026ed59fcb4…

MALICIOUS

PDF

87.9 KB Created: 2021-08-12 20:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f2ab7f05c84bb70f1f828049f56165c SHA-1: 9b7d1e831148f934476605ead6407f8a83e85d43 SHA-256: 4af71026ed59fcb4e8e73ac234aa3993e66d1189a19e0c8fcdb49dd65366408a
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. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The primary purpose appears to be redirecting users, potentially to phishing sites or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/e309af82d3cef76b0e678cd2a0181187/85395743350.pdf In PDF document text
    • https://telewebmarketing.com/FCKeditor/file/nenoxu.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/66203525398.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/85393471944.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/69622381625.pdfIn PDF document text
    • https://mytopics.it/uploads/file/xusotoxozuseligosodon.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/96972802530.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/gdksffum4m8ottpkgo1b4fa5pv/98984203922.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/donule.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/pitazotijujikarubaran.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/27440879196.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8b130b549---dutezukumoxulisobetadegi.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/130ef752b2e29e145546ec83dbf352d7/gedexok.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/75046761775.pdfIn PDF document text
    • https://shopabrang.com/images/files/vamirip.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/lisagaginavubanifamo.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/fonekuvamatafusuto.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/aske2b4b69me2169duf0s22t53/tibiromefegi.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45999534845.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/rigep.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/poleviguditededofut.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/8543446399.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/17748938442.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607897f4ef43f---11717196385.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4dc3dc6f1---96953978581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=dr+seuss+rhymes+generatorPDF 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_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4F 10632 bytes
SHA-256: 06cbe75880a405dec7d80b0e481361d893d793a04de18f532dfb43b29c7e3266
font_02_sfnt_off00012389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12389 17456 bytes
SHA-256: 2df0fa2ddf640b9bdcf6ce10f495f696806d9613fa835043e73a58050205dc94

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