Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d88ba4a589a308…

MALICIOUS

PDF

85.0 KB Created: 2021-06-25 19:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa45b1474cb5021535f77d3089c96231 SHA-1: 87356aa611c01a742a0435dfa49b4b8848e01bdf SHA-256: e6d88ba4a589a3086328c6e4b1c955e34e37e4ac45c2012faadd9cc39becc215
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96e22ca85---zalujut.pdf
    • http://houselandia.ru/files/fedadijamexosafupejowof.pdf
    • http://musorcentrum.hu/files/article/file/86300568737.pdf
    • http://broadgatecapital.com/userfiles/file/752297941.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca5ff2215b---vedomamafakoworini.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff311e9e88---29560687235.pdf
    • https://digireg.cn/upload/mepanabuxozirikipe.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/5abcu1h4mal6tj5qundhbuem3v/95277844365.pdf
    • https://geneticapanama.com/userfiles/file/witezaroma.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/fbfb93789fcdc9c247702dfd6dd2dde9/30444355443.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/75913893511.pdf
    • http://childconnect.com/swi/fckfiles//file/59782230378.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a62a7fde5---94208405707.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce8582df26---kenefaxixe.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/1fmtunse6s5j8efhij02g5gkpv/1041829789.pdf
    • https://bnbtravels.com/ckfinder/userfiles/files/19507572704.pdf
    • http://unsersohn.ch/images/file/90598334415.pdf
    • http://www.heksan.com.pl/file/79843458587.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3f587c1d---jategesidakuv.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/4329e5078829a856700369b2de2ba00f/34679885199.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b952eceec---pilixolavo.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/fasopodopofixusus.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+select+pages+to+save+in+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_off0000e883.bin
b339643780626ee4d2812ba55851df98e47bd25b25e2587458fced60893f8a16
pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 10840 bytes
font_01_sfnt_off0001017d.bin
a1f8a267e3760b80f16c37a25c3fa42e497b342ccb4e07b562e1defd7348f53e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 17328 bytes
font_02_sfnt_off00012eeb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEB 16792 bytes