Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76040301f7b9c01…

MALICIOUS

PDF

115.7 KB Created: 2021-08-07 20:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 39b0801c8ea16d2a5258a75a8636d710 SHA-1: d8cbce44d1343e2d8f7d1dfff67829302d1ff5f2 SHA-256: c76040301f7b9c01984793d1dd2b11a51166ac80d8701d8e672455a34ae5d660
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document employs a social engineering lure, instructing the user to install a browser extension or update to view content, a common tactic for credential theft or malware installation. The document contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a distribution network for malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://synerhu.ru/uplcv?utm_term=solidworks+2013+tutorial+pdf+free+download PDF link annotation
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/oafcs1qrpnu7b1p9vsvk4bsjaq/63102403019.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16109644c61ecd---30933871064.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/m0hdu71fte8n7d04erqgvbghs1/11398644265.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/5pp9e08sa8uvnh3v6e76l3dpk2/nariremamedisudiwokikepa.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vuvawijadojax.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/73311113469.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/48540c9198a2b55e8829fac595b98eec/kezuge.pdfIn PDF document text
    • http://annabarons.lv/files/files/vuvekifikesarixodipavu.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/23458428939.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/rgg02su0em9s1bh25a2irjjtof/xedamojijusiba.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/7604102541.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd7e9a61c7---bizoguramaxupik.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/4ce8bef14bbcd50328e01fb51a0b98f5/66034320141.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868b341108e---83077108619.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f35eb01f362---63091213348.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/dolesinaniwemikirafakozub.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/pozoxakapevokudotolom.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/zepejid.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/dadeturenozuragewor.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/17096157552.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/78022253159.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/gufekexigasewap.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/daxojul.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/gikosobotar.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160adb7819a361---zesilexedezazasisapom.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/zegozadonamofasuzudufa.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001798e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1798E 11312 bytes
SHA-256: f4e7f0b4b02771cf541603426921ae26b9c37e226a9815460331ffb556a35052
font_02_sfnt_off00019468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19468 16668 bytes
SHA-256: 0a5927147373d4c67b808aba0ab94b868c885fd14c516fb87bb71a2376afc335

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