Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d0a7fb670206d5…

MALICIOUS

PDF

98.6 KB Created: 2021-06-28 11:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f37894d36099ab64115f5c7d01425c4a SHA-1: c1b7ad58b4c0dc58a6e2692919fcf00a367667a7 SHA-256: f8d0a7fb670206d584da0d1fca365bbf22e3102eab8b7b75f1f826856419a567
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/bk5034cv96ug08r1taun4i2jmb/72356382897.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/letjgh8mas16cv2k78i8nukf5d/19332840141.pdf
    • https://ebooksweb.net/files/file/62260197531.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ae61fbd0252---55347249321.pdf
    • https://augsburger-dartliga.de/uploads/file/54384521489.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/43addc540dcdef9c8db5a172ae0bf365/60700732059.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e43008e63---lurapumifaru.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e794ac685---toginazi.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941f0b92200---fevubejijazafotuxufa.pdf
    • https://noddy.nu/images/file/92172300509.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160856be7904f8---73479238980.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/308a8a5419f80052a3ff8e3eccb22e51/49724049572.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/25f4e9f4b93f1db86eba235d32faa81c/81035223605.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cbfad461e53---40349731769.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/74892566171299ed9bb83933b9877529/xivujozejetuleg.pdf
    • https://datatech-int.com/userfiles/file/logezenojifurepo.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e25138c87---vigewerilubuxutuvidu.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8c3d21504---fenuwonira.pdf
    • https://chiataiec.com/userfiles/Proj_Name//files/74732311216.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f737bcea1f---392994066.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/0613d1d1b6c8ce7226484b3ded1f4f9e/viziru.pdf
    • http://hasyo.net/files/file/69983364185.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c05d6eb993a---xevexajipupagameloloboxor.pdf
    • https://thegioidongphuc.net/ckfinder/userfiles/files/kevoweworo.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b54faa157---ruroxinumo.pdf
    • http://www.lebedosapartotel.com/data/yukle/files/90034250617.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+many+books+are+there+in+the+old+testament+of+the+catholic+bible
    • 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_off00011dd8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD8 16792 bytes
font_01_sfnt_off000135ea.bin
e4807e9b456f694bbb5986ff2e357aa276345160f7e27bafc827c0ccb2bb3869		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135EA 17180 bytes
font_02_sfnt_off00016278.bin
ca0c03158e30b6734c218d9aec2c4da90c713362675cb6b0191189075e1587dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16278 11164 bytes

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