Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6159781212ccf50…

MALICIOUS

PDF

94.7 KB Created: 2021-07-08 12:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0a87948a0ba182be3159490c460d3adf SHA-1: 8fe4e40d9050ec3cefffb9adf93e6a71b1ab1bfe SHA-256: b6159781212ccf50b3793f645ca7c35af6ae4f9d34d27f46c33c2abf4ca221f5
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 heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely serve as lures to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://archism.ru/uplcv?utm_term=red+moss+agate+metaphysical+properties PDF link annotation
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160795ce8d5016---72101509664.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16c03c0be---zirarurofos.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/83257445687.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/75494769481.pdfIn PDF document text
    • http://normel.org/files/upload/file/vefivezanabedipaluxi.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/dumokerupupezetegugivij.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6921e780c8ecac343cecaf55adecbf0f/67207490036.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/21j9q5vsc2a4r8aa8p4k22ggd8/52151418736.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/h9rjff9at4kuf5f8k14utu8355/30353845573.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609307f24bacd---6373072056.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/gofewejowipimi.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/9923907426.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607679c30cfc0---xetokonowexezaxowubudogu.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160890e3c90646---fefiwilig.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160741b20e1c0b---57848628735.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ea2ab0594d8711db31b490023a408496/35309371041.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c4f5a248e---jukamobisuteziser.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916f109edf3---45888950299.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc2f29a688---71025116498.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160acad5364006---kujutilu.pdfIn PDF document text
    • http://momsystem.ru/public/file/34708354010.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a9998ef44---61955195915.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607497e0182bb---tigetibowafolupibaraxup.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/1b03a9e2759cf5509f343b198f4d3d94/zazimazeluzutav.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607490c1ea302---19391406239.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86A 11016 bytes
SHA-256: f2b8da4e70610bdbf7ed82e739a58be428c020999e0b6276957d15d4783f33f9
font_01_sfnt_off000111d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 16992 bytes
SHA-256: e8c5e7eb58c107d5bb3c85ff7ba3889a673bd588119e06f14085d1031fcc429b
font_02_sfnt_off00013e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E05 16424 bytes
SHA-256: ef8701eb79685041ba51b48b3ed5be6a2743d899f5b89193a8f0275675b44e26
font_03_sfnt_off000154c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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