Malicious PDF — malware analysis report

Static analysis result for SHA-256 3412bc7adcb56351…

MALICIOUS

PDF

87.6 KB Created: 2021-09-18 16:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a81172ec981898bbab16be6d9d14d2d6 SHA-1: 85018e67b681454ec38bf12af309b68e2f1f1e21 SHA-256: 3412bc7adcb5635134a15ccba6899a049cfa88341e732907c89168c24c19d650
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as a phishing trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://amigo-shop.105h.net/upload/files/gogupixodiroxumuk.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325bf03322d---tolem.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/c776fd4303c66e948559816a14540959/kisero.pdf
    • http://cpviettin.com/upload/files/88969126849.pdf
    • http://kunjipsc.com/uploads/files/xiveregavede.pdf
    • http://assytekservizi.com/userfiles/files/73215437007.pdf
    • https://holycrosshealthcare.com/userfiles/files/delelotezuw.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c064c3bc39---14216807409.pdf
    • http://viorina-deko.com/images/file/26808928358.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b64d5e98b3f959cf1a5da1b93493fa1/24579670690.pdf
    • http://enotecagaribaldi.it/userfiles/files/49843526715.pdf
    • http://interroadholland.nl/userfiles/file/83461942253.pdf
    • https://affordans.com/ckfinder/userfiles/files/92341842487.pdf
    • http://4els.ru/uploads/images/files/gefidenuridezalegesa.pdf
    • http://gpszone.hu/upload/userfiles/file/xizekukelufebuvoriraba.pdf
    • https://alexandrapanayotou.com/web/images/static/file/98773271531.pdf
    • http://sjzhtchem.com/upload/files/11386487158.pdf
    • http://cybernet-ap.com/UserFiles/File/visumumolufalafodok.pdf
    • https://micro-logic.ro/images/uploaded/file/xikonitetewiroroboboza.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/649d565b6dd921567b173cb4f52da8e6/jutelofi.pdf
    • http://4rrecycle.com/files/file/15141732632.pdf
    • https://rsvforum.com/userfiles/file/81595508645.pdf
    • http://serting.eu/userfiles/files/mufopomovupubafazulewaloj.pdf
    • http://lltsg.com/uploadfile/file///2021090201161938.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pokemon+fire+red+leaf+green+cheats
    • 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_off0000eb9d.bin
ab91d119d68ea5f3189d6bbcf61985a2d823792af7848b6c1e9aeb4d3fbb6e06
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 11016 bytes
font_01_sfnt_off000104d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104D6 16792 bytes
font_02_sfnt_off00011ce8.bin
316168f8f78bfe2f3d87b383424ecae2ca84d43a3930862d3103564440ba5fe3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE8 19700 bytes