Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1d2b0b3b5e4c75…

MALICIOUS

PDF

88.2 KB Created: 2021-07-31 17:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b527677de373ec75b3766229fcc4290b SHA-1: fa34179243a9a64cfe01bca051a870eedc831a90 SHA-256: 9f1d2b0b3b5e4c7589272178891b5be4b58b9faa63d252da59e2bb38da67696a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm used for phishing or distributing further malware. The PDF structure and embedded links are consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://krisoc.ru/uplcv?utm_term=how+great+thou+art+sheet+music+free+printable
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/6fb8192655422f255cba6bdc12a4fce4/66888650980.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9e992bb14---34752815066.pdf
    • http://clinicoral.com/img/userfiles/files/4465069042.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e498f851afd---gobudikavamomowelupegawo.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/9b5f2c4395ec060302fb21caaa6ccd2a/54256867707.pdf
    • https://relaxbotanika.cz/ckfinder/userfiles/files/muzotevoxonadiw.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/be92a548aa1ff0f71187f1c933eaf39f/wasadepataneluxateb.pdf
    • https://balajitutorial.com/admin/userfiles/file/genifojiguletefubitem.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caa8c034f4e---famirubekapudodi.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45345db46---rabivufapimenogukiz.pdf
    • http://derma-dts.de/files/file/karusifakekufizabi.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/2ea7de58bccc3766aa5b8c61ad19bc34/rakimobojozodovoxoli.pdf
    • http://www.haztartasigepszakuzlet.hu/pics/file/mavavutol.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f3b25d9a2---lebavogijusosepi.pdf
    • http://emmanuelmissionarybaptist.com/clients/74938/File/45685365328.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/9b8c9a64ab47a73d765161c8081d50df/74019187157.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/7591885177be739e624590c766bf027b/78685036073.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a3df6deb2---zoposusabulokekotevi.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/jh6ven79a72j0agbcibkr8r473/kudoteme.pdf
    • http://ankaser.com/userfiles/file/915231276.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a05936cfef---xozilijopoguwela.pdf
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34999581061.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/e0fbf9f099cbbbe3b04a032bdf343282/75658183820.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f408.bin
d0896415e846a2993f54731ec432c1a8394f79921f5c9cf899e4ac2c57990b14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 11244 bytes
font_01_sfnt_off00010e01.bin
cf42f1b5d41967048ecfc52f0b9092b9a85a328f5d60eeb5a4e14f56ad1ef494		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E01 16976 bytes
font_02_sfnt_off00013a5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5E 16792 bytes

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