Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b719c8a871ba700…

MALICIOUS

PDF

85.9 KB Created: 2021-07-15 17:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e9b015783de4a0d53869706422717df SHA-1: 39c66e45e4d21d70721abb1f0e2772ec51a1b93a SHA-256: 0b719c8a871ba70097a06c1f60f3ce5f7f63d64b443662585910d6b33d9042b0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to URLs hosted on compromised WordPress sites. The ML classifier and ClamAV both flagged this PDF as malicious, specifically identifying it as a phishing or trojan variant. The primary function appears to be directing users to potentially malicious content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://reelproductionshd.com/userfiles/file/29727833228.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d139bcc8c89975d68072a4558281cd68/60718258168.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3a2beaeb65745bbe96668d96c325b3ef/nagidatemamusiwowo.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a8ff788c8---bawabave.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/v1qlvc0h8gk5o2mt8febgpj722/96517820645.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7b9a6f23c08cf0aba2a2cf53fed851f0/73705432478.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701cb0b2531---feraluboraga.pdf
    • http://jagodkaprzedszkole.pl/userfiles/file/39771025287.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b0b0e7c9e38ec5963f84b001084c023e/pozepojoxoxo.pdf
    • http://cameranichietsu.com/luutru/files/lizakowixata.pdf
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/puwapurerevunesuwev.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hudsfjbgip8kht7auv5q2vbvlr/nosobat.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf4f742ec6---mufukuxaxavakazokekolopi.pdf
    • https://mumegram.com/userfiles/file/terokiwifasivitumubevobif.pdf
    • https://elektrona.cz/files/file/37882865659.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834ee813ed9---kasadosatevatuzirux.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/agh5qufk50kfffobcck7p15rj8/57619348715.pdf
    • http://tweddlefoto.com/files_contenidos/upload/files/15906320061.pdf
    • https://nirvanaegitimpaket.com/calisma2/files/uploads/nofelokopobop.pdf
    • https://hbphoto.ca/resimler/files/kaludumireruva.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/d584e6509282d97d165a9f441fcbb6bf/90305285995.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/32790a5bc0c947092d5186b3c4b72de2/zajavivin.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084946baf7b8---82298171138.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fadae0415f---fipatulasanilujotu.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c909bc6e65---koruvunenaru.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40dd137fdf---fenirakivenuzim.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=quotes+on+advantages+of+co+education
    • 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_off0000ed54.bin
dafadc57e49866dc1bc2d79c88c4aa7a43e0f1e2255ced84488341f6ebc0dc88
pdf-font-stream PDF embedded font (sfnt) at offset 0xED54 16940 bytes
font_01_sfnt_off00011927.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11927 16792 bytes
font_02_sfnt_off0001313e.bin
66ce6f7d5bd170dbf58cd517d0fb68f3bedff92c5a868fd2048869fc76040955
pdf-font-stream PDF embedded font (sfnt) at offset 0x1313E 10732 bytes