Malicious PDF — malware analysis report

Static analysis result for SHA-256 805f4fc211270d63…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 06:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cee1654ed917fb3fd353be99bb1fd2ea SHA-1: 350f3835839cdf157707f13a7a7804668a3e4ac2 SHA-256: 805f4fc211270d632e71e63d46b698535687a4f543cbc6b0e873c6ed3dbd1eb6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing attempts, suggesting a multi-stage attack. The primary attack pattern observed is the use of a malicious document as an initial vector to redirect users to compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://smidgel.ru/uplcv?utm_term=thoughtful+good+morning+messages+for+him PDF link annotation
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/cc5248fa7df54a6b6f9cdffb444d5775/rurapinefabolotinud.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083005a7820b---tudapa.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/14rb6kgfh1pbi2jpursa91skg5/degoxepi.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/13841018564.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/ritinelomifulujebojagu.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c39c79ca6eb7d2acec474c7d6963a572/37830931522.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/rotojajateputubodenato.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/robovetiroron.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a6ff74983---81717954963.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/xamogar.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af64753ee79---tuwunogedewibas.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/zomizewim.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/a9b1773a4ab844b167591105ff26d3b6/8363282797.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/74909836215.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6288cb0f5---lulonamolafebodexovavebo.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d023d09fa---kedosibikoze.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/jabiragigapofakesiluta.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/dljtn8o78u7rkrimbo09tgmemj/dogovupekabefutomalekatoz.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/4e58047014621a8d65f81bf1f3dd1c9d/sukivalixejopof.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/3251112712.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/rumasisudawaribumusokus.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78E 10864 bytes
SHA-256: d3b253a5abdd1d6f1eb60e7f40d3a55944d3fba928c0b016efaab43a3d38a28a
font_01_sfnt_off0000f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 17948 bytes
SHA-256: fb169aa31724f9ad53a8330ba12e3e2b550838f0f3cfe033f6fe1dc56d2c4bcb
font_02_sfnt_off00011e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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