Malicious PDF — malware analysis report

Static analysis result for SHA-256 685991102c60e122…

MALICIOUS

PDF

93.0 KB Created: 2021-09-19 06:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 87a6d0ba52c7257fee169b39eacf962c SHA-1: 2fd09500ea0611e8effd5268a01b70c9156955f9 SHA-256: 685991102c60e12220d9dde31a1e778823dcfab059ea37b6da920c7b257b738e
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous links, including those with 'utm_term' parameters suggesting redirection, points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/440d463187d6d40d6790aa038236c3c9/7022207607.pdf In PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409963443b6---44209397744.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210912022703.pdfIn PDF document text
    • https://melz-feu.ru/upload/7617613314.pdfIn PDF document text
    • http://kag.fr/userfiles/file/26236917120.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/lavekivemitigasubonurub.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139aa39f023e---tifegupoxiwadutuk.pdfIn PDF document text
    • https://micsys.in/userfiles/file/relakamovodupir.pdfIn PDF document text
    • http://ned.ru/uploads/files/pusadi.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/sexon.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210914082406.pdfIn PDF document text
    • http://mfcpavpos.ru/file/53648985742.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144cce7920ab---zusididowomebawunopinozog.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109110031569712.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/76937296786.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/31dea482c59b6a20650633791df208be/74942857548.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/37137564044.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/20439313207.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210910_AF4119330A209A0B.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/73579161659.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/73697642838.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210903061359_239897055.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb2fd9689f---muniti.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/darowumetizix.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/merufafanewagonozesusig.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/70a2927654c3d41944eb3065c430aaca/67648062467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=saw+2+full+movie+online+freePDF 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_off000108cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CD 10556 bytes
SHA-256: 1f44454d00d706f12558a5ee2a4a5a000164c6a88167ad31b273edcf22af1f55
font_01_sfnt_off000120f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F7 17264 bytes
SHA-256: 243cf42b9cd01dfd993df0d245a43c7076d5d714925c2f2415086461a1b5de6f
font_02_sfnt_off00014dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1