Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3a2c38ee90fa1f…

MALICIOUS

PDF

86.3 KB Created: 2021-08-29 05:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: ca2352b064b7b6d5fd815bfb17d6f84d SHA-1: ba4e30b847ec7ecdda8d82096c2d2d00f6970d1c SHA-256: 5a3a2c38ee90fa1f5b0bd7a5d1e6408fd9f18cb4b541d85c18ddfcc697b6bce4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://youxsoft.com/uploads/files/63956312661.pdf In PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210720_139F263796857AB5.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2e203002b---59757890787.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/80934345893.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/74066896571.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e9ecdbb47---wuwixapifurawar.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be71cc1f08---nopojatobemitoza.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/gefam.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6321826124---bakazuwapifoweberuri.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/lemijikovot.pdfIn PDF document text
    • http://greenld.com/userfiles/42100485269.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082e48c464f2---busojelilafukobewop.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/dukunowakijeluzur.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/8dbca19e5106345b761f63df0777ffac/zasogux.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/89711039220.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075c40fad99e---tokexijovajutakog.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/kawopopekudak.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/xirolakinasagoredipu.pdfIn PDF document text
    • https://soechi.net/userfiles/file/1303286820.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/28nm7ofhnvd6ag4aksin33h3ql/mojov.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/sutarula.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/d73822f9a0062bdd075d07d7ee11e83d/zenedupuxepatugojipik.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/49098421721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=antimicrobial+resistance+and+infection+controlPDF 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_off0000e6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D2 18732 bytes
SHA-256: 007822374676f00186fa98ed895e1a0e96ecadd0d2bb198c1da42992baaa5aec
font_01_sfnt_off00011769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11769 10756 bytes
SHA-256: 9f67698939f122240afc15325428e838106f79cfff95bba4a316311c141661d7
font_02_sfnt_off00013024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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