Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f063628ea9bc7f…

MALICIOUS

PDF

85.5 KB Created: 2021-10-04 15:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: aaf25a4c2968693077cb9cf4e0112470 SHA-1: 0dd216f2f273fbd8e13dfbaefe57e3de2d03fdd4 SHA-256: 18f063628ea9bc7fe58dfd63ead0834207710f8a9b655e92fac7ae3e7f0c5222
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute phishing lures or malware. The presence of 'cmd.com/data/files/' in the document text further suggests an attempt to execute commands or download payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://archism.ru/uplcv?utm_term=average+cost+of+delivering+a+baby PDF link annotation
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/mgr2fihqbjusdje5r1m0tsnutg/37870989473.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/zozuxuwapirakiwo.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/mogatixukokajisatix.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/f597d56948d0e818eee4617e16a28f0a/13448776683.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210910021117.pdfIn PDF document text
    • https://aademvegabaja.org/images/image/90593643807.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0e85ad736---mazogomiboxowuwowaj.pdfIn PDF document text
    • https://tavio.ru/files/file/43115781041.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/81380277721.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/bikox.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/91605575778.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/xinituvef.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/20703064172.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/basizarobojekunirar.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/mixakanogamogatowuxolaku.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/jiliwubetobiwewibasujepi.pdfIn PDF document text
    • http://qdcmd.com/data/files/4957026678.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/151fcf12bacb02a5e9a846b8bb3fdc5a/22331872523.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/lemen.pdfIn macro / runtime command snippet
    • http://woykoff.hu/upload/file/26811853080.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/nenazegaxuduxalepusodojov.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142534217d5c---gopibenuzunagilojititivus.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/80902452637.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613520cd25a9c---mudodubegosaligivopubame.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/96623061646.pdfIn PDF document text
    • http://alvitraders.com/files/kepisabamor.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-In macro / runtime command snippet
    • 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_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 10952 bytes
SHA-256: 9aee26a732adf8fdd7f34b4c401c946d069be80445e91e44f6f4b511b083861b
font_01_sfnt_off0000feaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAA 19484 bytes
SHA-256: bc2bf7bab4f924619739f77770116567ef4b6e603f9553a1251f69bdfcf92a3b
font_02_sfnt_off00013061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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