Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d4ec24ab86f6d6…

MALICIOUS

PDF

187.8 KB Created: 2021-10-08 15:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a6d7a1eb2dc165165a086fd6ab0c7b1b SHA-1: 77a5b53d15885944337a6ec0c5494c03343b591b SHA-256: 73d4ec24ab86f6d62b585b995f7c0e370a280dfa97832c2218754ec6f68a5185
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to leverage SEO and compromised infrastructure for malicious distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=lady+gaga+just+dance+outfit PDF link annotation
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/946643087b33d516c0fc6ed01cbe6ef4/donopunexin.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/30276594632.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/jipipokafinanegalatexole.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/38797438110.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/93336944955.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/jomozofokular.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/76600503838.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/vevetamilake.pdfIn PDF document text
    • https://andana.us/files/files/xowaxebinuxosugoli.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/24494896612.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/qj0id5too2mrsfpu5sn3ohuuc2/sopazafafudonitured.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/fisilere.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f3ebcde80---93941600930.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xatulifuvata.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613776ff93b42---zujawonoganubed.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/sisumeduborekolawirut.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/61516139834.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/78214524802.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/nemojetumopopemobatif.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/sizesorenexejumakopavonu.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/zebulufunibunadadevowona.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/76121320202.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/noborunuwe.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/4789987152.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/dotovaren.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00025804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25804 24812 bytes
SHA-256: f913532e46ca03c0cfbf8ce3c3318333fcc63267c6e70374cd7d3facf034a5a5
font_01_sfnt_off0002972a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2972A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002af3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AF3B 16488 bytes
SHA-256: c26743b87dfacdf0858f4b0a7ceb4ab939aa0c8d2a68f1ccae901a3bec0cb177
font_03_sfnt_off0002c64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C64A 10804 bytes
SHA-256: 2c3d193952172be117b9e1e0d76f69a78dddd9255caec7a5babe9ded4552c81c

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