Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a53e396d0b67129…

MALICIOUS

PDF

80.8 KB Created: 2021-07-03 15:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3a6dc1ea16d19f40f8f3b276dc05806 SHA-1: f876a0e76f86860c94810a4a19a85ccfef00141f SHA-256: 9a53e396d0b67129c1e902e6ea7aa9dab93e31bbe9c300a600dd1023f1415b6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous external PDF files hosted on various domains, many of which appear to be compromised WordPress sites or disposable hosting. The embedded URLs suggest an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://fotobolfestmeny.hu/mvc/userfiles/file/gatijemose.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/9b8ca29254e2907217292a355f7eb8e9/zarepuwijawavasunakove.pdf
    • http://aihyang.com/userfiles/file/vafowixoluzib.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/dapoxozotutiwavagisar.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/sf8eq9qjok93qdphvrq4cboc7o/jupomerijuxine.pdf
    • https://my-natural-style.net/upload/files/88296110472.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/luvezuwetomoninemabefa.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0a4678d923b65727839ec4903479ac1c/36832095788.pdf
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/68520362105.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ba0bd1191---23441050409.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/f7bcab525af02c5ca6857f3105018585/feginuduxetamajid.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/8dd77040995f64e17da7daf0e350cf6d/21290541972.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00c1c7d8a---12272578158.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/31c6e69c9f2c5b36d5a3785f16133f40/maxelapuxidixubemukezit.pdf
    • https://avayemehr-carpet.ir/data/file/domarevanupesupola.pdf
    • http://starrsgazette.com/admin/images/file/welat.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/fewuwuzo.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607236a74009c---36152326591.pdf
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/flc5bp750rsh2l60gt51nm3vrn/ketubenajizezerixopete.pdf
    • http://aarogyamedico.com/userfiles/file/vosukubujurarusizudori.pdf
    • http://upoart.com/ckfinder/userfiles/files/92781924347.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16073720a38e5e---godivitosa.pdf
    • https://acryl-bg.com/userfiles/file/musugafaxoku.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160afadba8a880---56977384085.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc41e75a39---33305481099.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+pilgrim+house+provincetown
    • 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_off0000d71f.bin
8ba7d011c70858a068d06912e371287347f576c4cbd05bfc353566764c108a3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD71F 10872 bytes
font_01_sfnt_off0000f025.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF025 16792 bytes
font_02_sfnt_off00010837.bin
041dc932564ece5758528c23fd808d95dda2f7f4d3ad098b29e39c0ffb2b877d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10837 17596 bytes