Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fb3499193384b3…

MALICIOUS

PDF

76.6 KB Created: 2021-09-19 19:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e5b4236786d4a54d155d9cde47c1a20f SHA-1: 4f849dd263b8df394afeb37769623fcba9fad1be SHA-256: 91fb3499193384b3b747f1f0dcfcdd1a23b00180af8be8b8d54c4de2ce6ac9ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS uploads or disposable hosting. The presence of embedded JavaScript and a high ML classifier score, combined with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests malicious intent. The primary goal appears to be redirecting users through a chain of links, likely to a phishing page or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=how+to+download+apps+on+a+fire+tablet PDF link annotation
    • http://ohana1bbq.com/uploads/files/99771851491.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/ximibaxepofixozenisege.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/29204696121.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/0i3imvut1rbkg9d7t0tkan18l3/66412471793.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdc8bde936---92422890534.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/vezutojisokilitoxepuzo.pdfIn PDF document text
    • http://gdgom.com/upload/file/210908200639994225orx1dg3h0th8.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/26187300430.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/27037218189.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161384e7dc9181---2433584772.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/73329693347.pdfIn PDF document text
    • http://iphysiology.ru/upload/jotizovolasikuxulix.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/fununajikometizujajuto.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/pomj490fshpuq9b0ut26k6574k/gukepefu.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5e9788ade---wipazulipar.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/laxugunu.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/tuduvonu.pdfIn PDF document text
    • http://winso.tw/userfiles/file/tutawik.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/51829267232.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c856c2be5e---kakilirefulivixori.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/nurubabibedoset.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d3b36bb3b---13083014783.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/64564476.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/fetezedesanuwofegijiveg.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 17356 bytes
SHA-256: 52dbfa367b5c9a3dab1e77fece4bb899f0e206da59099a8c7a3a4e09d977dc02
font_02_sfnt_off00010c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1C 10708 bytes
SHA-256: cbda690c43d278532d03a701c3ff79fa77952ac29db7ffd46f0dc0f4b0191bce

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