Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fd91af3fdfc155…

MALICIOUS

PDF

106.1 KB Created: 2021-07-07 05:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 55c5c785be3686feb58bd36123c2b541 SHA-1: 8daaadd79a902ee65ba795e019a6079a5482f32f SHA-256: a9fd91af3fdfc15533b0376ae80d5808591f3f70e3c010a1bffdb851be9362f1
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. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, likely to distribute further malware or conduct phishing attacks. The presence of multiple external URIs and a link farm structure suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://ketchas.ru/uplcv?utm_term=fifa+14+mod+19+android+download PDF link annotation
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6b9520c82---36513533878.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/jodikil.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/lopositobegisawarijubodur.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/jhc2evmchm97epqforcgln19o5/14855276028.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160755e5537b20---xarogutodep.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082520140c27---76734290110.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/0adc4627005c9b9a999eabdd551e5c86/zasogidizepanijuv.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe21bbae2a---66411330821.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/61172939581.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/a4cecd6f29b5f80ee443e66020f15251/velozulasas.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ce48c8e15---52906129728.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773ee49496b---samerelomagiwujoj.pdfIn PDF document text
    • http://centrons.com/uploaded/file/175818095760cc788e0c341.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/nepigopulosuvuvap.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/65542348058.pdfIn PDF document text
    • http://www.samlab.com.tr/wp-content/plugins/super-forms/uploads/php/files/289382qeb2h0pj1l6qclovmqbs/68424417406.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861dda21256---bixavarem.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/rf28elprob4lho7jadc1liesfv/fevufolu.pdfIn PDF document text
    • http://cuacongtrinh.vn/upload/files/gojafososipuzofamanavib.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/e17n8mac28n5vpdosnb8v6e28r/rafizanido.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9b0078741---gumozepul.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/tiwimesenimatezoxet.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/a0b0f1267a725976812f0e35b4efd408/pixidegi.pdfIn PDF document text
    • http://www.ipkameralari24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d779d28c386---67311419461.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3084462b57---welub.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
stream_004_off00014a5f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14A5F 30692 bytes
SHA-256: f95cff9f4425967b5a8b204b2a9621a93edeb605f664efa4c8a27ed7a7af4f2f
font_00_sfnt_off0001016d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016D 18696 bytes
SHA-256: 4823b1f20a0f77a206c1eea140eeea515d5b12b55856472d3d87d86bd738f2b6
font_01_sfnt_off0001324e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000180b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180B9 10480 bytes
SHA-256: e0efa2cbbfda599a137a60477f9ddf3142e718beb14f32a6e9d6ad9dd8b5c0a3

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