Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35d219454c57499…

MALICIOUS

PDF

104.9 KB Created: 2021-06-27 21:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f026cbaa1ff7ed3a25b815d3d97af05b SHA-1: 91db4ab98fdfdae54689689f35089c55661d83fe SHA-256: d35d219454c57499d14bb7de293cfe41b408a64a464b3522d5573cedc627c9af
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute phishing content or malware. The document body is unreadable, but the presence of numerous external links strongly indicates a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://ctyrkolky-gamax.cz/data/dokumenty/maxomifezobapo.pdf In PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/be6ed859c77487ef0be7ee4f73c4e496/73437336027.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/54346643046.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84577754fc---74960535273.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/sovifetisagudobebokulum.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af6e119d673---56783576182.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/8b085262cdfc519a596e780f979c298a/bavugefina.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087b910c33aa---58476025584.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/15e809b98744eb0aa749e5a1268108f3/12686701773.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f5c4ed88c---nukadav.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160be5f1ebae27---fesurogofegipafagudoba.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/zimax.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/jdi07nq2epa2f0ll8dvc4fdss7/lajuraxa.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608680b346683---ravedufiwagegagoxamovu.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/wolovivonileboperi.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/ecaa8ae215bf47580e0ff293e2209f62/viren.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/zagowanovifupemotowuze.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3ed627615---bafonukejukoxe.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06c5e62e44---48450774968.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/rabakomozakaguxarizagudix.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/03c25773624b86aa332bb7e06af9fb5c/lugowemojovuwufapojugi.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bfbf75729---28430491739.pdfIn PDF document text
    • https://dineflon.com//files/66668149877.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/6832679070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=rss+player+channelPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001312e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312E 10320 bytes
SHA-256: 78a7eada97c8bf09f09a5fc61b77421e5fa466f0908fa61dd3f6a8941ea1d84c
font_02_sfnt_off0001486a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1486A 8712 bytes
SHA-256: dfef302dff09c7ff546bcb44842571073af4e02826617ef7d8387478d6176de3
font_03_sfnt_off00016454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16454 18148 bytes
SHA-256: 03c25415211443a95a1d16eb01630e777850b1b742a520fee8afa44990996585

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