Malicious PDF — malware analysis report

Static analysis result for SHA-256 27300c5b5fa44c66…

MALICIOUS

PDF

71.8 KB Created: 2021-09-03 17:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f0842074533767b8a21f84e0b533049d SHA-1: 2795d12cc3097d1255dc3383a3d3abe7d8bec61f SHA-256: 27300c5b5fa44c669effcf409b16fad376e2c88fd2f644539dcd97ef4abbe02c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to various domains, many of which appear to be compromised or disposable hosting. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user interactions, common in phishing or spam campaigns. The primary purpose appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=om+jai+jagdish+hare+aarti+lyrics+pdf PDF link annotation
    • https://adasms.fr/userfiles/file/16254303109.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/25513537808.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf25990895---78337667267.pdfIn PDF document text
    • http://iphysiology.ru/upload/51250563542.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/17458841652.pdfIn PDF document text
    • https://efnnma.org/files/file/47477646381.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/414142a6713b3676c0071f5f3d41c50f/87333056451.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/93776070739.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/55673394266.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160888c1c795a5---zedere.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/091917481501.pdfIn PDF document text
    • http://bmhs1964.com/clients/a/ae/ae3b7fe25fc1fd458a9bccd7578bee9c/File/12446744651.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/98ac46de3b3413b4161a44e5c3023097/razomuwagotit.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/74444836606.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/51434631131.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/gijezitudidogilemumidux.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/40dd4489ab5275c0aeef465a7386f46f/kuzisijawegitezil.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/c228c2268fcc170a82929474d9035887/16536126942.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/73724c56021e3e2305f28d00379af0ef/didevakiririzof.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bd83a6a3a---tezowasuzisenexa.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/45597922732.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/9a5826fbc32ff352fff3e6f54bdc83ce/xarudolukufi.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_off0000b1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C8 11112 bytes
SHA-256: 28e6c7795cb10d20ca71ad2cd2e3f96ad0b3532bc1c3b2330f499fd6cddb79d9
font_01_sfnt_off0000cb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39E 17980 bytes
SHA-256: 714c08b170eb1c2cdd1e66cc21b039561eade27d478734118d65b9d892ca799a

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