Malicious PDF — malware analysis report

Static analysis result for SHA-256 45297547c8d0b7a7…

MALICIOUS

PDF

78.2 KB Created: 2021-09-03 15:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4588f531265a5ae019c0a4eba80c8e3f SHA-1: 7027c450781e79f3045450f26e76a88bfe0b1450 SHA-256: 45297547c8d0b7a7d8f57d25b2da7a5cdc5d2c4e24b300ed54d37c3792edea00
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://mg001.cn/upload_fck/file/2021-5-13/20210513023356722863.pdf In PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce72843b9c---19490871763.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/8266758046120f47860e45.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ucrltc90ooa3g3rgsqo89ahfie/14640427879.pdfIn PDF document text
    • http://riceart.ir/basefile/files/vuruwa.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/vevixis.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6b2c64f2f2abb5f8c9dd7a8418f64f0b/62789271905.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116dc4ae0462---kebukoledelaxasawer.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/df019bdeb7af3f683a5dbaea83f50720/12734631249.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/48202249336.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16093b5bdb16f9---pozafobogomubunu.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/kevumevegudosurafugodive.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ff2e0e936dd969bab4ec866ba4de2607/jerijinufo.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/4c1ab683014b21f855e62049ad6aace3/54768330997.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/51399654302.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/tasidupapibede.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0f96168ce75c233d92220cc881d0d0ae/kobenojugiketopifuxi.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec41d97b76c---89303532891.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/0546571870c67f0e619524cfa7d370b7/16723080244.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57894807042.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/6664637362.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/7bfdff27c54ccda24942ec6cf98c3624/momenaxojorotovom.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/zufujepuvenabukipotabur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=teknik+konseling+behavioristik+pdfPDF link annotation
    • 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_off0000cdac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAC 11040 bytes
SHA-256: b5ad6b9dad62b2b23040184672d4127811ce9cc32835ee0f8bb44de8b1e7da4a
font_01_sfnt_off0000e6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF04 17256 bytes
SHA-256: 0107a11eb8ff3b52fc9384e5a613bc99ccb6ee61c8d6a4082ed4af3eb2d8bb0b

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