Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb19a257be7fe59d…

MALICIOUS

PDF

83.5 KB Created: 2021-07-23 14:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7efc78b2a629e6c0a6d07d3cc6d8d240 SHA-1: 87a0a225beeef74235c6f9c2c6c284cd3f76e05b SHA-256: bb19a257be7fe59def4ff749ad62a82453383be3b19dd7bf2e61ce4cc6b4c66e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary function appears to be redirecting users to potentially harmful content via these numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://b-solutions.net/userfiles/file/ruxazek.pdf
    • http://o2ashop.com/ckfinder/userfiles/files/27401685602.pdf
    • http://ty6600.com/userfiles/file/wedavipijinujamesawog.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/p0oaoh3nvcmqm9hu52sf3v0jkm/nofarilopewavuliz.pdf
    • http://myxroad.com/upload/userfiles/file///85868064377.pdf
    • http://sartor.ru/upload/files/bunejupasivobuvafumula.pdf
    • https://jkmart.net/FCKFiles/File/nutawalulagekupoleror.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e220fe0c86a---renemivuwalimerajisevaj.pdf
    • https://uzmanwebci.com/calisma2/files/uploads/76236728530.pdf
    • http://rogersdesignhouse.com/uploads/files/41901394763.pdf
    • http://comp-art.ru/userfiles/file/tobetuboxifuva.pdf
    • http://bayernglobal.de/userVZ//file/22625013184.pdf
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/49110573805.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/63925188471b9ca3b0dbbc967a9aef07/faparuxofaburaz.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a94bd9969---61194757916.pdf
    • http://endemic-capital.com/uploads/files/fuzenevavutuvujopovisepo.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f4fe1d14---didopuloburapezedarob.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/8ullenks8ptgh4jal46tsqhadt/33918808778.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ea4b9a4c9---wezerotukum.pdf
    • http://szamosiszerviz.hu/feltoltott/files/verile.pdf
    • https://renebeumer.nl/userfiles/file/rejopetikedimolig.pdf
    • http://bellsazshihtzu.com/clients/878694/File/52637607710.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=genie+garage+door+opener+troubleshooting+won%27t+close
    • https://www.thc.gda.pl/ckfinder/userfiles/files/53443667255.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e041.bin
876896f338bc1c0e3d1c3aa316875e84dc21bbd5623b4bbb9c0e29f3e6c6e566
pdf-font-stream PDF embedded font (sfnt) at offset 0xE041 11192 bytes
font_01_sfnt_off0000fa15.bin
7447447c6c5f9f4fa4650ca39bc4fc7bc8d91feafff80d8d60526c356998e7f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA15 16768 bytes
font_02_sfnt_off000125bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125BD 16792 bytes