Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f611008000db4e…

MALICIOUS

PDF

89.1 KB Created: 2021-06-30 13:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 32541a24ca9a3ba63bac2d92df7b1506 SHA-1: 81cfdfd246ebce51425fdd6dbc3c4b6f95977543 SHA-256: 40f611008000db4edccd42dae448c2c6ee7fb769194e2a12d7c25672c588c59b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely intended to lure victims into downloading further malicious content or visiting phishing pages. The presence of multiple distinct hosts and the use of disposable hosting indicate a deliberate effort to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/fd4abeaf6144d74fd363b3fc128bbe22/gexosozunala.pdf In PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a444f4d0c8b---15072263648.pdfIn PDF document text
    • http://beateromer.com/bilder/file/lemafaxizotuj.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160883b5c70a69---pedegatefiketapomifeso.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e59a736bab---87630238213.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/kumipapesowiziwafofib.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/91482154549.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/54ec95bb411ba03c7b918e7b5a673ce2/75500691629.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/1dt4ih7ng11kpv7bfvt5ui0d15/22895756189.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/burifurovelasuwubetugupev.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f95c2072---60289746934.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/85673bd89421852526b140a63ef8dd73/25111866723.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/74968047484.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/4ea0a6c7076e18e57e621e09cc564f26/45438519271.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/5cr1evp3k0pr19niqf6rbot4n3/58162954648.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/97619891046.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160978df513829---lebifovorotedefavu.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/76888256688.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779e62659fb---sizibedakud.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/31904542302.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/1652792808.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/24913991891.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/foge1ioksg46nge9oi8bka9cch/43007748584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cardiomegaly+in+athletesPDF 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_off0000fac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC6 10840 bytes
SHA-256: cdefc64c9df10d238d7500fdb844fedf9d47e9c6800fcf768f4d054a3595ce50
font_01_sfnt_off00011362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11362 16928 bytes
SHA-256: c3f96f0f6e734f15f5abfc5c9fe43ec31954d8d2a290850fa93cf0da885ca663
font_02_sfnt_off00013f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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