Malicious PDF — malware analysis report

Static analysis result for SHA-256 037085c158de2920…

MALICIOUS

PDF

85.9 KB Created: 2021-09-12 02:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8ee5a47edd90bcd2e87d0b88ffcd28a SHA-1: 3811cca543769493ca3cabd58ce38781d2675bbe SHA-256: 037085c158de2920bb2141bb6f5558d7b1b9d8a4b35cfd49931edb63dae391fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated, but the presence of multiple external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://britishcytology.org.uk/ckfinder/userfiles/files/15527995824.pdf In PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/69771655081.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/44be96b3d5c528596b858b9569d18bf0/lipuxeb.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139d999692e5---16528146534.pdfIn PDF document text
    • https://beautydent.hu/editor_up/60284971676.pdfIn PDF document text
    • http://fructusartis.com/i/File/fatesomogakedivevuvaji.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/samunesusulanukobaxigis.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210905204438.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/26826092871.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/92067987880.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/3201e453715e6cee4f7958eff9f8d926/pugududejugevu.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/73610395498.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210909131133.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/28435517840.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/mesawisogudemavilakok.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/40449380379.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/wixejiwukoluwutiz.pdfIn PDF document text
    • http://falcon.dk/sites/default/files/webfm/60876692935.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/28678811565.pdfIn PDF document text
    • https://arendic.cl/files/sajadovufufowubejevaxised.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210906053649.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/bugovokulisulabuget.pdfIn PDF document text
    • http://agilesolutions.in/uploads/4262587126.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/80162763740.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161366bda75af3---surojubotofubobowone.pdfIn PDF document text
    • http://skrn.cz/pic/file/rixarew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=igi+2+game+for+androidPDF 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_off0000efa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA4 10456 bytes
SHA-256: 782b118cf4a3961546fb50978035a3965f3bf84835617d3586ceb01a9d50da45
font_01_sfnt_off0001072a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072A 16752 bytes
SHA-256: 1cdbf7725a5fc314e5e178eab84da14f1655a67731e75595e19e774fa1e252e7
font_02_sfnt_off00013268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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