Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7657b3a80976ba…

MALICIOUS

PDF

87.1 KB Created: 2021-07-08 14:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed603911977a1a72fb772d50a3d9a048 SHA-1: d8944eefc7dcc5f818446e3d99d02d73e53e469a SHA-256: 7b7657b3a80976ba77ee6fa044d4feb000d95805faf1734fdd23186c3ab48c37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/f8d0599d297067f22997dc13ae49ac33/lipakamef.pdf In PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b21f6df27a3---fudidetoxubajujo.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/nifisazefukunuliwajir.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/gonanunuv.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/414726e760988e080eceacc21d32340d/buzedogew.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca8d2bc2c9---repotakez.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/6qsmqmbbvoaisqr1hdcvu4p7a9/35278193245.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bacd65d0c9---bopivolibilarutog.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/33598cc8f4707a01c4af6047405a5d45/sadebiruvetakasifo.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a2f9a2ff3---xuperuvo.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6794592c5---74532056724.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/foxala.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/v45l5ahl2j5s7vkbhkr0l07ee4/17778900212.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/qrtc6eq90gc813bjoceqmrk0o2/losomumuvubowuwuguvarok.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/2t5pum2oghs7dlt45oc4tbfql0/kibipizugipokizizate.pdfIn PDF document text
    • https://bojovicsirogojno.com//files/wafonube.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/c2648b2c6839f862b785affa52c222b5/45380886733.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/rodijaxugojedopabeputobej.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e61d5b4eb---muzewiwoxipibifepiwul.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/2188001234.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/n068p0u8hv5vcmr54pn6u8reo1/72448801057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=8k+ultra+hd+wallpaper+15360x8640+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_off0000ec4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4F 11644 bytes
SHA-256: 4dd66ac742be8e4cce71e0a5d5abf2d0428ebfa72194626a838f0c3bf9b10c95
font_01_sfnt_off00010815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10815 17920 bytes
SHA-256: dfc926b10ac4dab3c66e65db2b300aaf484deaa3df33ef6a169c58adec9ae334
font_02_sfnt_off000136cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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