Malicious PDF — malware analysis report

Static analysis result for SHA-256 8535b449111551d0…

MALICIOUS

PDF

84.0 KB Created: 2021-08-27 18:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 7ea10ee597a5cb047fc28084cddba47e SHA-1: a39b26711e5f93bb479fb0bdd231634ca33f0bac SHA-256: 8535b449111551d0a8637f256adf16adffdccb077adfadc45fd0a97c17d9a923
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 0.9925

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://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a5814598a93---zawidos.pdf In PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/0de5fbf00c59183986bfbe076ef2aead/zivafoviveseme.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/9ivlelo3s781c9uq1sbfg13ob6/xozapodipavukos.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e854b01475972984c4af71031777dc91/tawarerir.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/82546024164.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b56b8ef8d8---kuwafukilaxul.pdfIn PDF document text
    • http://maybomchuachay24h.com/Images_upload/files/zajomolebegafotu.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b20671408f---30389766576.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b58a1cf7d3---5579224696.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/56088683503.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/vpb1qops45hb6fetai24svkpae/gefetakexuzijavuz.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/54662912963.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/kaxileluj.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160798f6228d95---padunazazonogawefip.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a62f95dbcf7---zezunomamabatawu.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/dbf47763817ff5e859688d8de1b59c5a/67161740878.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/78718742060.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/nemigetazidozulumu.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/9d75f34279dc8bfa1313a5238741572d/sexogutesaz.pdfIn PDF document text
    • http://bienbao.org/uploads/files/94130317268.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c727b3bc1---97040953772.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161168bf606f3f---21223404796.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/mga34lkj153vic4eh70lo8t875/79538191136.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/aee5ff20a317afab3f44dc35ebc69902/49588177280.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/jijifufotiduronade.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/pojifefozokafob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=henry+the+8th+first+wifePDF 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_off0000e703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE703 10384 bytes
SHA-256: cd1dc04ca78d8ddb6662b53a701620a83a42adb7c19196d9730b688489fedd7a
font_01_sfnt_off0000fe78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001168a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168A 16684 bytes
SHA-256: 2a5d24858b198b51859a362bd4b7784601634898f2687a18787af712aa3a9852