Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a119d64d251278…

MALICIOUS

PDF

100.9 KB Created: 2021-07-01 19:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-07-13
MD5: e8fb4d7f7941e1ec768f88ef045d1252 SHA-1: eb4848235b3d896004a72aa5d725202c84cdff82 SHA-256: 16a119d64d251278083908fabd69a4edfb74355aff85b08cb42edb0703e5a28c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to download and execute further malicious payloads. The document also features a large number of external links, many pointing to compromised websites or disposable hosting, indicating a phishing or link-farming attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=mathematical+proofs+a+transition+to+advanced+mathematics+3rd+edition+solutions+manual+pdf PDF link annotation
    • http://logisticsnetworks.net/ckfinder/userfiles/files/26196812730.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/67409959658.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e5956b100753de898eb240760c12cc18/gowaz.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/zigufepevorojaje.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608210b85ea43---jikarowimudavup.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/5bb9e97cb5af7e9145e0aed7368e79dc/jawog.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/45261632907.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092dd869fd2a---86444839551.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/75ak45cv0ebguldqrpf07ac0a9/47049689096.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/39162553561.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/49463e2a9f07cc113d8c0dfc90c43b19/76755699016.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947d6e7f534---58714000860.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8a392b66---kesuxoluxebusaxezevipaxu.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/bf0e43554d6f3766473ee53ab3fac7bb/91758559711.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725f6390eee---63371268295.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff0a253c01---nizexofok.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160db32c5cc4ca---kimenofuboj.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/gosogonitagokigujorewitem.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ba16b1a412404b06d908e3e6ab159daa/ramudapesozaxe.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d50dbbedbb2---bivawopasipubatapugib.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afce17ecaca---20564910825.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/53030109077.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/53ed83548ef4305da78f82ce668c79ed/zujibifatuxavujimidul.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/bubovina.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/72095865496.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1e222cad8---54022526948.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10903 16384 bytes
SHA-256: b4b6ee02561df059e8853bd969e68f323d42343767b178a8795449a98e705d83
font_01_sfnt_off00011f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F94 19060 bytes
SHA-256: dac414dfe39ecdde0d422c2632c4329f8ac128a432d9826f38ae4c6a96d1cd13
font_02_sfnt_off00015256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15256 11216 bytes
SHA-256: ec0bd55abcc477dadd89b65e5970d3443a02d7a85ab8ac51a376436564439f16
font_03_sfnt_off00016c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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