Malicious PDF — malware analysis report

Static analysis result for SHA-256 21068bd8b95acc39…

MALICIOUS

PDF

75.0 KB Created: 2021-09-07 21:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de8fedbb0d4e91a2d0c4875f891d5d8f SHA-1: 42d59001cef96b68c2fbd1573e11bf5861af49d2 SHA-256: 21068bd8b95acc391031f69872e1a087bc65eb58d8060705c51f8fc8007f3b26
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm for SEO manipulation or malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://didula.com/img/file/xomamemuxudaxipavaf.pdf In PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f774e79977---96489251343.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc02958feff---tagokojinemogiwidun.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/0862dd1fafce138b8bdfdb9c3f2a923e/dexivuvimos.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///58689452078.pdfIn PDF document text
    • http://eventechsite.com/files/files/xosakoworademapiwizi.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/afd4dba8c3f874a8316a6c46804318b8/rogodajuximutukenugaj.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/samiripatuxinixolopufego.pdfIn PDF document text
    • http://strandedtattoo.net/file/gelogokazume.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/wuwafogafadejijumigufo.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/21732124258.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f77c4f2840---85168927452.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/bs22l7499mqo80uuh5c1db850p/63631627473.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/vavega.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/5eb9fa4eb72661560bf8e7e969333efb/fikawidomarojesuboto.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126d43ddb04f---fifapavenikazuwefuxako.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/15454650473.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/judajo.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/17350932198.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/22149008555.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/30355049669.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/xagijosujaxiwizeraj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=whirlpool+dishwasher+wdt730pahz+installation+manualPDF 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_off0000be32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE32 17796 bytes
SHA-256: a13def93b6472a62d509159e816348f7aa0cbb6fc3906bc058e5fc07f6776899
font_01_sfnt_off0000ec43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC43 11240 bytes
SHA-256: e7a77c8b581a92a471a1e17ca7d4f67c73b26694eed90a6a3aebe0e0b3053b9b
font_02_sfnt_off0001068c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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