Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7373f9b237386e…

MALICIOUS

PDF

72.4 KB Created: 2021-09-03 19:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1ed7b3c7dcaeecd89fac212745c64631 SHA-1: ce9de30cbeb6d09afc62dbc5e8e04dcd1f9a235d SHA-256: 4a7373f9b237386ea19dfa00a5d7560f563e8dba39ca75115b705d2592cd6d6e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to other PDF files hosted on various websites, many of which appear to be compromised or disposable. This behavior is indicative of a link farm designed to distribute malicious content, likely for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://nomylo.ru/uplcv?utm_term=sanskrutik+varso+yuva+upanishad+pdf PDF link annotation
    • http://bjallstar.com/upload/file/kafarexij.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/41600944349.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/nunawigikowusa.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/16876350865.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/90579043190.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3994eb671f8e8cc13bdca770baa87b8/73949303760.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/ca53b0854fa8fdb6888792f8a0f6982f/71613827063.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2999dda6992a2a5b10e9b97bb4cb3746/46793494286.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b5e958385---wevupopupatojedazuwasax.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/tixaz.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/p05hk8olqlmkumgh3fnch78qif/bipitugalafes.pdfIn PDF document text
    • http://faradbox.pl/files/file/fijuziruwulumebuvipu.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/lizagudalak.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/28872726519.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e4922983d3---vopuxidizelujopogena.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620911746.pdfIn PDF document text
    • http://topp.pl/_topp/file/48720115008.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2a06a26fee51dea63d11bcc3853acc95/93555211061.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/85021128441.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/cddpkg0esnjb1ut6odg99625au/95186250457.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160712208c784b---muvem.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/lomapomaluf.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5b84d8610---36217781987.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/7731453208.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/kitibowenezilobemifemu.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/oetq2ce9kchec8oerjf9evu6d4/narazekegolesijasezub.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_off0000b832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB832 10864 bytes
SHA-256: b62eb8ce0d3c5ed711f0592bafb151e1b84f5226ecb6436c3cc6d99cc3c326a1
font_01_sfnt_off0000d146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD146 16372 bytes
SHA-256: bebe4a57839db861cdf5304761f394bdb6177eb67ec6163ba34d574e48d07889
font_02_sfnt_off0000fb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.