Malicious PDF — malware analysis report

Static analysis result for SHA-256 375e3a2b828f7a86…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 10:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e89a83ffd91b04ca37bc606ad33bab33 SHA-1: 49a139e51acc5e8968f5b5c5d0d48591cbe23b02 SHA-256: 375e3a2b828f7a867ec975f110aa4004525059a646fe7d9b5ae7a033be384e46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and an ML classifier, and is detected by ClamAV as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous external URIs pointing to various websites, many of which appear to be compromised WordPress installations. The primary purpose seems to be redirecting users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=2016+dodge+journey+manual+pdf PDF link annotation
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608240c9cbe29---lukufasexego.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607faac0cf359---ruzutixitim.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/27434160234.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bc8ba20e1---73770864074.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b4c65d4eff445215cc509b8ac26f2acc/79065222213.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/66dba67af6674e6b32da79693f722968/23066487134.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d34a2d36e89---vunipabubefakozuzefufasus.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/2fbde3166dd6717125c6900c291f31c2/87127102274.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/3265ad1ca3984c83c5c024a6c9e92d4a/99848017335.pdfIn PDF document text
    • http://parquessolaresdenavarra.com/userfiles/files/xebojet.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/62360355958.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/vizawuxifuf.pdfIn PDF document text
    • https://groupburuemas2.com/contents//files/94490186045.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/29867968142.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/49206302428.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/vamaninabusebotogeguf.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/81300297536.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/3905632754.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/0c50e51f02e66e8e85ef1ddf3255bac6/17303498687.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161035a604afaa---27152659399.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/mekevovogun.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e0d308abf40---vamunitebituko.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/e98d08a1b2a1bd772eb5ee91533bc3da/xidujexoma.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_off0000da38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 17700 bytes
SHA-256: edae2465c49dcde0510fdaa2f0e8c14e5fa22a0b062650da93f05528e4875856
font_02_sfnt_off0001200e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200E 11192 bytes
SHA-256: 8df01d65736db976dafcf9493c3881c5217359be9796a57a270a310f8174b73f

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