Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd55c18436ba1de…

MALICIOUS

PDF

83.8 KB Created: 2021-08-01 04:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4edeaca249198824adf567d5ea9b8e84 SHA-1: 752cd8a0ab339c7a234566ac82dc4e8422edbbd1 SHA-256: 1fd55c18436ba1de5b939297184017884464b78a7b8ba1e4a2290239bb6b7935
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 0.9983

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://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/8a21cf6f941ced9f802e7a78f545f217/66784278130.pdf In PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c9e3031de---zaxokusefu.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac3765c149---15101327224.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/6f9a8433e9b97f7b7dfe2681e94b315f/xusipofasisumu.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/bipuma.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/fimivetumaronanoludabota.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/fajukutoligifesigebovem.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/82435054555.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/a98598a5f71dfb4b625d7e77bf0417b7/nesufufovatinumelexo.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/e871f1c968c0f59eebb338750a214f12/90823225360.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607936b6a1272---32724269879.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/26f5d6cce45cdc25c8b41a64e625ab38/11289298387.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/fujaviren.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/juzopeberolopolojojaba.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/45457266638.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/369ff34e72d6e00ecea029af8cc02596/47891499766.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/cflfrfhipi5bknkvbbpvm7ncc5/tamopatefilol.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609457fef0f1f---40492047216.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/23154541162.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e1190c4edd7d5a73dc09c962711ebd10/40293450624.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/bb454632b949b5da24f323f9d744820e/14992292960.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/pobuvopuf.pdfIn PDF document text
    • http://maihome.hu/admin1/file/46708062548.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021519553325083.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad309ca401a---45912652849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=symbolism+in+lord+of+the+flies+chapter+6PDF 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_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 16068 bytes
SHA-256: cb7eb76fd70e9c848975b13aa982ac8b22ef7beaa3c0a7f884cbadb4794bb40b
font_01_sfnt_off00010c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2B 11380 bytes
SHA-256: fc7cb267ffa6808c726b0b725aac855b6325cecd0d9a898d26e602f98e9bdc6c
font_02_sfnt_off00012692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12692 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1