Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72821037163104a…

MALICIOUS

PDF

87.3 KB Created: 2021-07-15 19:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 555bfe3dbb1237ad057c33a478cde5fc SHA-1: 6c45e30fffaed92ace934e700bd36b834af41251 SHA-256: b72821037163104a5c0cdc84b416e619417ad96364b8b33e12b17969e38f3873
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and disposable hosting. The primary purpose appears to be redirecting users to malicious content through these compromised sites.

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://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/a687b040e7ad1a51745cd488ebe517e0/dorozije.pdf
    • https://panama4d.com/contents//files/25575111664.pdf
    • http://www.aadhar-interior.com/userfiles/file/55662238210.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160724e56c47cf---japipesovexefizum.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b68b2afc7b---3505712475.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ad4dd87b1---nakemosudubut.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/74b081aadaf4d7cb9442c8bba7004ef2/76820998620.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad49c7c82fc---75970588862.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e33edbff8---28805073573.pdf
    • http://inezorviskids.com/clients/37546/File/bufusiwarim.pdf
    • http://gccde.com/downloads/blog/geust/files/mukupisete.pdf
    • http://paoladebenedetti.eu/userfiles/files/74771079664.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9ad53633c---20001477473.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160982f4f02e26---1663315903.pdf
    • http://drairtools.com/ckfinder/userfiles/files/32638187172.pdf
    • http://norilskgu.ru/userfiles/file/lisujuwutotikovevedata.pdf
    • http://erbaytag.com/resimler/files/13609563624.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/2514bd37717c5827e83d54b7073a1269/85658053110.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074a3c1420af---munukebodozexa.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c439648c86af1c5b93820f059d1f8f34/koxilaxu.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/k7j4rr9e13grmmgp45ntie4pnt/pitikupola.pdf
    • http://montaze.org/democms/userfiles/file/9371355683.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16082d050d3971---92212368615.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/drscmep4eg8d8tjnf6fjd5f0n1/44760400073.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=biofeedback+and+stress
    • 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_off0000f388.bin
7d884636257982961793051a4f1c6da0b0f737025215eaa920176ceb6b673110
pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 16736 bytes
font_01_sfnt_off00011f27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F27 16792 bytes
font_02_sfnt_off0001373e.bin
3ec1e37d5573022e6c0beb30f8156b18a7d31d514a9a2e01a0af50bc2f9a9178
pdf-font-stream PDF embedded font (sfnt) at offset 0x1373E 10708 bytes