Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19606925510119a…

MALICIOUS

PDF

74.3 KB Created: 2021-09-16 15:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9219d17d31587f1a201b80f088163cf1 SHA-1: 491a6bf23ac6577194eb583bdbca5c5e1174d8c3 SHA-256: b19606925510119a2ccecd4b2cf4b05fd3e19f2a5959ec0def67b9d1c0038672
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm with numerous URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://floridadressyourhome.com/uploaded_files/userfiles/files/sezarubasuwafubejeragutal.pdf In PDF document text
    • http://wangyiphk.com/userfiles/ruxenubojijenazidukumod.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613beaee1c9cf---55555587401.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/638b517d6323435f5a37198fd90e4c0f/wuranidovekazef.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/gapiwowafufilorinitu.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/34203480479.pdfIn PDF document text
    • http://klenderbio.com/upload/files/veresebarob.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139939ccd671---parogagub.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/vasulomupujitowobevinaruf.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210907170439.pdfIn PDF document text
    • http://devveb.net/userfiles/file/28876095810.pdfIn PDF document text
    • http://dentherapia.hu/files/file/paguwodezet.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/96144999da9c2e81a856c5462e8e922f/78160073039.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/zosopujubogepi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139f17f47043---9661161120.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/7201367260.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/zofetagumavinulit.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/47010222950.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/81720737155.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/30185963793.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/bixuxasuvidefoxituketi.pdfIn PDF document text
    • https://efnnma.org/files/file/48715139902.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/14760913591.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/79238377501.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/30964581993.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/e3b83ba9c31e53aaa82070728d6ad513/dopunodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=wordly+wise+book+8+lesson+6+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_off0000bef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF6 16612 bytes
SHA-256: b9bd4bacc7b89d079b01fc87289860bd21b331bce141f3a65caabc0636f989fb
font_01_sfnt_off0000e9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B1 11032 bytes
SHA-256: 5187a0cb505f90c3d6e0cf584fae0c92e72780b5cbf5191d6b703b1b29fbecf3
font_02_sfnt_off00010347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1