Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6657a80b8839c73…

MALICIOUS

PDF

73.3 KB Created: 2021-05-08 21:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 592c14d92905a178d9e32dcfa1eb904d SHA-1: a6a99654ef9f2b6be6e4e36fa0f529208f700008 SHA-256: d6657a80b8839c73cb99287291ee2fb81b0d5f02abe6feba67004722727c9767
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6416aaed90002c194fb58897316329d7/zoxema.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/suv9j3j7920tobk3ui3ct5r3n6/jujanoduwowufezako.pdf
    • http://agiusfuneraldirectors.com/files/file/sarozomevevekabudub.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f7b78132cff1f57add2ca1a28c458e45/buturutanona.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e8c66da1a---23630272048.pdf
    • http://aarogyamedico.com/userfiles/file/fomaramemiv.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607362dabcac4---28678314068.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8c1298684c1d8cd3e71cb5f5e4746456/noxajarijimakizo.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/77b6ee1590d54a0582e6fb43700db2f0/73011443695.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/3ir66q98mn93tuai12btnsn6iv/50244848303.pdf
    • http://softwarefactory.nl/images/file/13384853682.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160839e59170b2---rabaviginudepuxetapunixad.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607895d621e8b---tupopatimulivukesugaj.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094831f23730---44187628954.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/5ec6a91ae2532520665d0a966972c887/6880670313.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703c241cb22---92179741612.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607886e448a3c---jusivabes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=cambio+climatico+en+mexico+2019+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e539.bin
81056c328db680870403187f8ed7ca1e54b91fd0e1de4e35466620036d4ae738		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE539 5624 bytes
font_01_sfnt_off0000f84e.bin
95f00668b1cbe652c96dc473e18cce6b9423d370acbb2a8b54c7cc5a9c2a0c1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF84E 11420 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.