Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ad64b537ea79ff…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 19:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a6b687f21379a9dd45dca770a054c5d SHA-1: 430b780c41b172ab91bb44cd57f5ce02ed08ba76 SHA-256: c1ad64b537ea79ff5f78f9494a811f54ae61fe74f7eb88f587a8977cce6b2351
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, designed to redirect users to malicious sites. The 'utm_term' parameter in one URL suggests a lure related to 'download five nights at freddy's special delivery', indicating a social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=download+five+nights+at+freddy%27s+special+delivery PDF link annotation
    • http://aftckwt.com/uploads/file/livaxutiravu.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/nosaxixugozefuk.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/xotilobidiruxewexosipedo.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/45050303468.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210914062654.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/22226381732.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/loseradavujomelinegulotor.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/dujoxegetoripavoxex.pdfIn PDF document text
    • https://visualarchive.bg/files/80697410795.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/xafabiv.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/vozadowesepatogerawuzotak.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/844fdfae687fd24ed5585dcc2dcc9736/56697419584.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/besududogejikoje.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/n65f3b1l5k2e30t3ku79tpf5j2/20576951471.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/86721827261.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219151726523414.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d3183978d---popagubifojoxu.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/nenilorakikalexelorabozad.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/sataferukutedajeba.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/pupilevibilen.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1fe85b9c9---15583192267.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_off0000db0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 11200 bytes
SHA-256: 98b7cf92fbd2bd5e5619d77c135e8e34019152525e531caf33cbd0525d12169b
font_01_sfnt_off0000f51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 18112 bytes
SHA-256: b80785b45fc5031b3ba6abcd0dbee683c44917275f00eba7e8401ac6468893c8
font_02_sfnt_off000124ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1