Malicious PDF — malware analysis report

Static analysis result for SHA-256 169e12b8a52383ce…

MALICIOUS

PDF

87.9 KB Created: 2021-07-30 00:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6da9f79577da22cbc8f92a35fc07d5e6 SHA-1: ba5fa1247b67eab6022579296c45d9d12d857234 SHA-256: 169e12b8a52383ce640f10fd4afa50c67b7f085e8f46315375624d407b8919b5
196 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content. The presence of embedded URLs and the heuristic 'SE_LOLBIN_RUN_COMMAND' further indicate an attempt to execute commands or redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609d916e4d5bc---tizinedugipafib.pdf In PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7654cad08---29252422197.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/miwupakefi.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/86576203010.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/un7o935bd6td1vu2qsmkajue07/57478270948.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/8cf432944c3d5beb6fa885c73ee9810c/3199671103.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/pexodureresogesawowojob.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/tesaxesesinemebuxib.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160777fb8a5b1d---90036213886.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/92983956805.pdfIn PDF document text
    • https://penal-garazh.ru/files/lisazexev.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/de3db71909c8669a3c75064874b5faef/62370224506.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/ea94emb2lqn1g5e2j64754kqt2/ketusowewukoku.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/7l8cmd3t2d9ujg4ndf1vf3mjkm/52500408704.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/84a872d20973aee50f67844931b35253/nopubivafiwufifuxiwifol.pdfIn PDF document text
    • http://rockghs1965.com/clients/8/8c/8c68d0bbb6adb8fad5f76254a0516489/File/femegipamepimizuzazuvad.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9137cc399---vulizibenanowapegud.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9563186f90---rodosixufaxeravere.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/81605015648.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/61147407554.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/5061917954.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/nopumaba.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074755dad5e6---papavorewi.pdfIn PDF document text
    • http://hongdacable.com/d/files/vikowegirakowaz.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2317899bc2---85110179702.pdfIn PDF document text
    • https://chp-travel.ir/data/file/28355905739.pdfIn PDF document text
    • https://www.actioncoIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+make+soy+wax+melts+with+scentsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3D 17080 bytes
SHA-256: 373117d6091ebb1bfbdaa8bd809f52ba947d97de326f4895e672d0db5a94a609
font_02_sfnt_off000138d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D8 10780 bytes
SHA-256: e09ea553270065822dac7bce1a2e1da4e165f26101aa275d3d816e7e4dce628f