Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40d28d99cf784ee…

MALICIOUS

PDF

74.2 KB Created: 2021-09-13 22:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de9952b2865f3b970b1a20d2feb2f68b SHA-1: 3582611c3019d7369b8e96fbbcf002e77d2a4c51 SHA-256: b40d28d99cf784eed928e63a1218192f6585490dcdeeee6d85285f7eeda302af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS upload storage. While no executable scripts were extracted, the structure suggests a phishing or malware distribution lure, likely intended to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://rcvizovice.cz/ckfinder/userfiles/files/69197669869.pdf In PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb3ba8a130---vufagupelaki.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/24357373101.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/fogeko.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/19219549536.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/kodimojagumaxuforizaguzu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9a5b74c12---58120004512.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/mipolomugenev.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e6588641e---18828155138.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/02a263e4ac84d6bb6a5e4bee5958a6ce/tekikitobaseximokiduw.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/4f53506f53dec552f802bb554ed81e08/87710227463.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8aee85146---59709714501.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/727184033a1d005e96b11a856f96d64a/kawigedirusabupepifav.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/15802831237.pdfIn PDF document text
    • http://imoroz.by/upload/file/31588123877.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/betolanalepikidanope.pdfIn PDF document text
    • http://freetds.net/userfiles/file/dubazivamofikekazewujem.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/897c2924fe7d0870f7fa823459532ef9/xobidurapesoto.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210913035813.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/wepipoge.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/kupobitixax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=friends+watch+online+123moviesPDF 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_off0000be85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE85 11108 bytes
SHA-256: 23cb71ed8564b1504a70bdb262710a4acf5be1e27e4f336e8dc16320ad9cb677
font_01_sfnt_off0000d860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD860 16784 bytes
SHA-256: 5f2a9656aa4c1583b601fb0103a9678a34658185458e4cd8d4fd1e5588d0241c
font_02_sfnt_off0001038e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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