Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5622d1a7fea7c8…

MALICIOUS

PDF

75.3 KB Created: 2021-09-09 04:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9841d39e161f9c6377ad3f48ea26ac8 SHA-1: 285d14a774f60b00e492ac9b58871d6147c093b2 SHA-256: 3e5622d1a7fea7c81a6e4424a10a068185364b083b80e5c051cedfde8ef7558a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://rmp-traueranzeigen.de/cms/files/32707893867.pdf In PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/baxefovaxewogavadapa.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/loxufodefanoboke.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/48826816334.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/60266713159.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/5763488605.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/vezawifewej.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137e58a919ba---3086873186.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/kosiverujubulow.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/buvazejewa.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/dezerusifudelefuxiwilewel.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/a5043853f62c5b1e70dc269ad8c276e4/37540032193.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/30228421496.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161393f7574058---wijakiregawox.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/giwajegazowasimitexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=win7+home+basic+32+bit+isoPDF 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_off0000c187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99E 10824 bytes
SHA-256: 1c13ff5b6fc705865950f42fbd98376db69c65a3edaa6466ce44bda172c50c6b
font_02_sfnt_off0000f28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 17808 bytes
SHA-256: e73a72eabb98a067d65859be7e30eea91d2ef05596ec3842142f3f25a57dbdb2

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