Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ec8cd3c1447c61…

MALICIOUS

PDF

78.8 KB Created: 2021-09-17 14:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 200f59ac49c95aa5e1b5d737f7270db9 SHA-1: de04bc8efd151adce9afdca0f25bb869886eb068 SHA-256: 61ec8cd3c1447c6153295b26c2de810906062fbad9e3fb00351b6ce962945f22
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farms pointing to potentially compromised websites, indicating an attempt to redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://adeptos.clevercloud.pt/images/items/files/69302175094.pdf In PDF document text
    • https://komunalno-vrgorac.hr/files/51868871922.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/38482287490.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/sifunimanirorebukepov.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/nukaxuwi.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/bajoxesularulajaxe.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/pokevupel.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/fozeg.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130772bac27b---katagapofilufim.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/4un4v4nqu13h85covki7f3g4k4/zojogefapuniwatir.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/xerofazovo.pdfIn PDF document text
    • http://okvin.org/userfiles/file/95246621069.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/70972967668.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141af83b8cac---79993685444.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/lavetibelop.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/nuxaturudage.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/lewukagemop.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/71723346124.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138506ac3cca---josemijiwe.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/pgj1v32u2qiojqikr6ktvlg3h1/63837163787.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161437acac2978---38923007241.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/esoliku.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/1238198766.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/23440711907.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/supasisebix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=www+filmywap+com+2017+tubelight+moviePDF 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_off0000cdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD7 17300 bytes
SHA-256: 380586ca6d9576f5278d2a99653fc5fb324eb21f826a77f837b8c8e2b6057c7a
font_01_sfnt_off0000fa70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 11400 bytes
SHA-256: 4d114021b8156c8b6f966160dcb464fd6e4cd6e2c1a06dcf622b591e35640aad
font_02_sfnt_off00011550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1