Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb7b1433be43508…

MALICIOUS

PDF

88.0 KB Created: 2021-07-25 09:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d5c1e4bd79122c76f696253a1d7c2742 SHA-1: 92dd1484b80b44142d973e26c2ac799d2ac3f6b8 SHA-256: 1cb7b1433be43508e2293a713b13d484083848f6e3a6851a7128ef99ea471b7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs are hosted on various domains, many of which appear to be compromised CMS installations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbefc8557c---63309460802.pdf In PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/6d39ce443d1f2bd3aa5b1cf10dccc26c/23300249170.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a730df55b---28391510050.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834459c9dd7---57691597965.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0652e175b5---5019047877.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5988922c9---kavovafojemedetovar.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f8f71b6a56b9b2767fb6c60f1b8a0d69/36345347477.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7d8cdb14b---megagobedaxuwi.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210714090523.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/tizigovelati.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/49268886753.pdfIn PDF document text
    • http://inse.us/uploads/images//files/rizusitazek.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608d666bb186a---famuvetakixuxub.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5f47498e9---zelironevudud.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eec8c2c942---marogazorana.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/84440544454.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//vaxagatevavakuxuwas.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/79144411532.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/430a94784b10b879906b8c41d9ebd0ff/toduvedipelanebesib.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/7b1uuhl846cguu6be7lbg4eau1/wedumefitokurozusigamab.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/dc99925921d6ff7da00ee02523fd1b69/47839239123.pdfIn PDF document text
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/22718501401.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/0a917d3c8b502b099edccb2bf36e1ebc/debatakuzekepusasoru.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/rjufile5tgm1o693jdrlg1cdtr/bexokorogekavelometonoke.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/8465987da0f1e00e754061f5e47b7765/58191917498.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/9c1987c7400bd1c6a16772e25c49b8ad/jijigekonodolitez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+are+the+criteria+for+bariatric+surgeryPDF 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_off0000f4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F1 10812 bytes
SHA-256: f62ff7899f33cdb7e2bfc52bd5b148c28d39ff1aa8d4122446e41d1641bc348d
font_01_sfnt_off00010e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E14 16576 bytes
SHA-256: 608eeaa13b8feb5c4a232f32f0ccfe16f9c352fceeae4e6b2e507610bac77184
font_02_sfnt_off0001390c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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