Malicious PDF — malware analysis report

Static analysis result for SHA-256 820d29dda0463810…

MALICIOUS

PDF

86.5 KB Created: 2021-08-04 16:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 227260f8e7219bbb7b0f810c7597f1ee SHA-1: f702aadb9b7eebde1d6cda9fb2fc8a8880c6edf3 SHA-256: 820d29dda046381046fe15873570ebf9af2ae0fdf4550890af70414ec4613288
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb8d10a980---sediveruferiwifupe.pdf In PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d708e0ad83e---kebata.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/d3eb5e8fcbc0e76eeb59d110464a9a0c/29502176387.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/9tln659308raag0c0bi19hd5g8/92603608027.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a052a01bb93---xeburolutovubujudeto.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b52ab89387c---foxorimagovudajipota.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4755aabe9c---pikajolegenuralapal.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/2066942890.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/1857543554.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/70494158919.pdfIn PDF document text
    • http://glcore.net/ckfinder/userfiles/files/36001269065.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/64421924308.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/cc0b7391d8f04b33dc3e8513708a8bab/filuxurumilamezovoz.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1d59b085bd76e4c9c566a8d62baa1ae7/pofipofip.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/36d1690f86b8be8bd7a9bfbc504867fb/51974091756.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/dekujurugagitodopopo.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610071a19fcf3---bazoninijagesizativuja.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/16971877421.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210724091816.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/9c6207afb89dcd48041abae92856cf08/zorunogomiwekanoxarulovim.pdfIn PDF document text
    • https://ivaco.it/file/78953718660.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607764197e298---8345036823.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/7118795817.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e9abc1f0e8d9b518f8179f7eecb34ea1/numawimupiteluperomufiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=espiar+whatsapp+2017+gratis+en+espa%C3%A3%C2%B1oloPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/66265561967.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_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 11280 bytes
SHA-256: 3f5f6f76c9bf77dc5595fff01c06fdf6afd17eb22a03a161293c97192338784b
font_01_sfnt_off000106b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B6 17036 bytes
SHA-256: ab94ace66798195b541d1279913d0c425f76685a1188a6e3a82dab613706e97c
font_02_sfnt_off000131b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1