Malicious PDF — malware analysis report

Static analysis result for SHA-256 e02daf5af2f571dd…

MALICIOUS

PDF

90.5 KB Created: 2021-07-28 08:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7ce8fa39ae2c21a287518199ad1edcbc SHA-1: 024381ae39c16c46d274bee549d6ab373c981b6c SHA-256: e02daf5af2f571ddff15e6994195b1d2f3289d05f7da0c1f7163ed3e9bbf4c9d
216 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating it's a PHP webshell and a link farm. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • PHP webshell / backdoor source critical WEBSHELL_PHP
    The file contains PHP server-side code with the signature of a webshell/backdoor (named PHP webshell banner (madspot)). A webshell takes attacker input from an HTTP request and runs commands/code on the server. Flagged as a malicious hacktool artifact even when carried inside a document or archive — the code does not execute from the carrier, but the file is a webshell.
  • 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://prestinieurope.ch/userfiles/files/27419402285.pdf In PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/807efdc5bd728f7d9ee98e437ac9d425/58484716876.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents//files/65594044354.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/52536756572.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c71ac498c---31778668408.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/86031698430.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608080461be4d---gerevev.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/19916230691.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1ce8155f3---7713582797.pdfIn PDF document text
    • https://deepex.hu/hirek/files/85312935859.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/womokabunuko.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/51160958615.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/70490250593.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/8421671358.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/21e0ba7e000e8a03ee4f00358f73cc68/18325281541.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/2f5c68c09263ba88d248e16f39a58138/40789778720.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/1282db1cc6f5d578823395269dc726dc/77726044678.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/59948474725.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e3c94b902ef---bimoje.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/d6urmc8oevlc1m8vldod3nj51q/50008856628.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/susopavobusazuxatapugex.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/15b0f79c8bde62a11048b86066b86596/bewejofizomanogebosetod.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/fumud.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e71d443ab---54246654823.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/vibedaganivajumofupab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=diferencia+entre+estadistica+descriptiva+e+inferencialPDF 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_off0000fc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC40 10560 bytes
SHA-256: 7011983c43ec5df40e826028b12e6b8a8f9ac4fb34c5884af5de6157aa385562
font_01_sfnt_off00011481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C93 17596 bytes
SHA-256: 1874c57ab024c7515ff1cc0ccfce64d49d8407f6140184054df144d81ac05182

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