Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f49aaaa4f4de97…

MALICIOUS

PDF

74.5 KB Created: 2021-09-19 18:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fb20a6462517b3534c9645a6425ef18 SHA-1: 174d4ef5b87ccabff496bcc8c88002fbe40cd341 SHA-256: 70f49aaaa4f4de977e4add3d244b7c4a0c2a12c74b26d6844b6bf3b0b72f6826
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories and other disposable domains. The primary purpose appears to be directing users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://gildiamasterov.ru/userfiles/file/ronetijuvunixarugonekeli.pdf
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/ferasede.pdf
    • http://spielundlicht.de/content_provider/documents/files/dekomazekuxogatafexina.pdf
    • http://robvancampen.nl/userfiles/file/laxexaxusom.pdf
    • https://almuhja.ps/ckfinder/userfiles/files/77845297019.pdf
    • https://kanat.com/upload/ckfinder/files/76488353781.pdf
    • http://www.dr.schure.net/ckfinder/userfiles/files/zowonujinadafazepakaxuwak.pdf
    • http://kozelsk-adm.ru/files/uploads/files/25183955111.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/770ab1fb6e5bb051819ab510579e4b88/birolifofuferale.pdf
    • http://aardbeienfeesten.nl/uploadimages/files/tejeroforatugux.pdf
    • http://teplorium.su/userfiles/file/59744959060.pdf
    • http://stellar-toys.com/ckfinder/userfiles/files/xarovefamijesazajuwin.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5481dc0136e928ba104d7f8e1f6d2e0f/dawedanutuku.pdf
    • http://soyaksiesta3.com/userfiles/file/45511738150.pdf
    • https://malinaionescu.ro/userfiles/file/17432888057.pdf
    • http://cadelupo.it/userfiles/files/20783597307.pdf
    • https://mahae.hu/files/files/jakobiwafixoxi.pdf
    • https://pezenasenchantee.fr/userfiles/file/88181600638.pdf
    • http://termocity.by/pics/files/79408884903.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd6f62adc---fatezabajavafavulug.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/d40f3c1d5c2d82e8e839dabca4e5425d/muniketugilozuzikej.pdf
    • http://espaciocultivarte.com/ckfinder/userfiles/files/36756305538.pdf
    • http://allamericannursing.com/userfiles/file/zexugisevawubovezun.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=love+me+tender+sheet+music+pdf+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c11f.bin
6d422972fa45eb2b9fcbcebd20dafff9665c2d4fb391cb56cc5f0a6e89997d2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC11F 16468 bytes
font_01_sfnt_off0000eb76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 16792 bytes
font_02_sfnt_off0001038d.bin
b5cb3ba4e43cb763c99949a4f6bb38100b34fe2589bf43d3d9a6bfd60f71c635
pdf-font-stream PDF embedded font (sfnt) at offset 0x1038D 10800 bytes