Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16c1123037dbff1…

MALICIOUS

PDF

85.9 KB Created: 2021-07-04 02:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9ead1b9b351dd223b6d70cfd3e8b6e44 SHA-1: 68fab480bfcd918f7f95090a8aef9114f765c09d SHA-256: f16c1123037dbff11fd10cb45244f90495dadc3615b22e7a49e967def776c04d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, many hosted on compromised CMS uploads or disposable domains. While no scripts were explicitly extracted, the PDF structure and link farm behavior strongly suggest an intent to redirect users to malicious sites for further compromise, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kotolantopeni.cz/file/86779476187.pdf In PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986b0aa9262---54775273759.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/8611fe7139328bfb4a1323a3eff00120/66015444696.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608000873d273---87183083008.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90471fad8---pakunat.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a61c395d272---riguvu.pdfIn PDF document text
    • http://belst.by/upload/file/7117684123.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081625678f4b---tidenotavekerag.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608081cbab76c---sadulusimawiti.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dcd52a3e5---soxabonojarone.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1341ff0a63cfb56fb58c953106aab34d/zupefedu.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/65131754631.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789b2634dfc---60628983903.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915356dc13d---25390860231.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b9bdd18bb---56882129838.pdfIn PDF document text
    • http://asustainable.com/global/file/pazolosovomabonarutaz.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/23a20b6ef1bcb18a3f88c49634cc7c0f/7511674953.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/98602466321.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/96576362059.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/2p639fiutjk67g862mce4afhdd/81852478552.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/bodewujozalokibuzebuxa.pdfIn PDF document text
    • https://dhesient.com/media/bokalopagogesuviv.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/86481235004.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/76083879653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=tinsley+new+york+housewivesPDF 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_off0000ecb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB2 17708 bytes
SHA-256: 88e89fd6fd00b9ad2e494b3fe27c74ab2f9e2c618875a11b8569ad748cba1af1
font_01_sfnt_off00011a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9D 10368 bytes
SHA-256: 0639640577e163bcafbd51e8848a9ea41442c139b5ffd930afdbadd5ce03535d
font_02_sfnt_off00013206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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