Malicious PDF — malware analysis report

Static analysis result for SHA-256 599da504a252a9ac…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 03:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 90294468ce4f9c5edfaccb456427f355 SHA-1: f314a4dec22f80a5a7b82f49adb6551d535910b0 SHA-256: 599da504a252a9acbd073906cf4e1ea3a7a7885abd66cdc1cc0bd0df8761cc05
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of 'cmd0/mepebudiginubulojosol.pdf' in the document text, alongside the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, indicates a deliberate attempt to obscure the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/rj2lmuibd1eq3o2933ro4qtta8/giwesud.pdf In PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/tl5fa9jrmistcod482u09kcmd0/mepebudiginubulojosol.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/gq0dgosnbeltnkktousvs7j110/fuwimaviporurifedidenija.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611dbcbbc3ff0---47777095013.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/77344844922.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/61473112495.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-12/20210512130025525531.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611173dfc9d37---wuranunisodorokuwavagari.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/fexigepilipa.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/fichiers/69539298752.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/nepitawamarevolanut.pdfIn PDF document text
    • https://manenshop.com/upload/files/vitamoleze.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815f25c2217---99274360274.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/bazipujunexebarikadifinu.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/75575133123.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/xiwirerunofilukavejadugi.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/2332465186.pdfIn PDF document text
    • https://amblamy.ee/upload/file/lilefivon.pdfIn PDF document text
    • https://chp-travel.ir/data/file/tevis.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b246113064b---52910586413.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8062468adb---wufogefunesesob.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210817095230.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/zizaponaw.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=brookshire+brothers+application+pdfPDF 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_off0000d6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 18048 bytes
SHA-256: cc4db1b3e3e83da58dfde823bcb3c581afa73977b9bff9671154e049592c4b0a
font_02_sfnt_off00011db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB4 11000 bytes
SHA-256: 3818f9743be525b0ba069a96b0ae57e3cf73ede24e12a342289e4ccd4482f5bd

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