Malicious PDF — malware analysis report

Static analysis result for SHA-256 38acad67a72e716a…

MALICIOUS

PDF

89.8 KB Created: 2021-07-01 13:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdcb9b0672bc958b810f97277f6fdbca SHA-1: 3369103437f2510a2f713e85972cf0f770f4ad08 SHA-256: 38acad67a72e716a6978ead09f9d77273a62a2f3b3fff03054a55f8ba00a9f3e
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially compromised sites suggests an attempt to obscure the true destination or leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://shopinhome.com/ci/userfiles/files/93826678914.pdf
    • http://www.findvoters.com/userfiles/file/99673067911.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/74dacc78512c906aa31c6baca876de1f/40603873088.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfc4897d09---nazapudeselag.pdf
    • http://thaihotelsale.com/FileData/ckfinder/files/20210629_931AFCDCA5EE95E3.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/xadave.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/prtggp4dhcpi2826p5113dqc30/wuboxovizenobedovexupidow.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b21f2a4f9fb---62886295919.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/bunagudulozon.pdf
    • http://goref.ru/files/file/36465586007.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609276864c497---sorimexagalesolidexe.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160888a0cbc1c4---lajikini.pdf
    • https://planet-for-events.de/userfiles/file/suviwabivijebim.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/fd40beab51ad858196f4b24847db7694/suwukavopofem.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/0677f83a7f622db978b7819a6f189b62/30204554022.pdf
    • http://parkhigh65.com/clients/4970/File/xajupavewake.pdf
    • http://automsystem.com/UploadFile/file/20210505182957686.pdf
    • http://arnold-sitter.com/CKEdit/upload/files/55411139702.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076f88a2145c---nepofukuzi.pdf
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/vozaje.pdf
    • http://nowyhotelik.pl/userfiles/file/57185038524.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/411bc05b77648fccee0e54fa94bb0c89/74935544881.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732f35f3282---jisodobasuferuwiziz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090268d977bc---bevosidiwizopup.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=mountain+sky+conference+umc
    • 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_off0000fb36.bin
718db9bc2b675e56f29737fdf0cab8461b5e6a9017437c0068842d204d41c650
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB36 17616 bytes
font_01_sfnt_off00012944.bin
731f5051faa677729f8cad5094d0f577141886125e25765cabaf7890a3051532
pdf-font-stream PDF embedded font (sfnt) at offset 0x12944 10748 bytes
font_02_sfnt_off0001421d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1421D 16792 bytes