Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7843f74ca7ef44a…

MALICIOUS

PDF

85.0 KB Created: 2021-06-27 03:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fae43a004354b55ee48f156ffee1fa2 SHA-1: 6be145400b50f66db379aa92f508dd3fa0005dfc SHA-256: a7843f74ca7ef44a9bb359cc5a11820b25836cd23db073138388ae21679b437d
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL analysis and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://sanruou.com/app/webroot/uploads/files/6248456145.pdf
    • https://jdlpartnerss.com/userfiles/file/3295773296.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16229766621856.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c142e1a5c78---jesorubin.pdf
    • http://maychamsocda.vn/images/userfiles/file/zenilobafukigatotaniliwik.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/81907193936.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b4b5d7481a444a5f1b4078bdf4c00d78/70242104799.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/4b99af7d558b77959fcbaad015d9a1c9/fogumodegejogijesefef.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/453c3f8719ad5c088f01fe5457aa8bda/8246554994.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d48d6d8aa---kejoje.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c955789d58f---kilakatakevifaj.pdf
    • http://xn--80aikni6a0b.xn--p1ai/images/file/surevavimawum.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/pigglnhq9aal1o5olnbe381air/12268306383.pdf
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tupikijizaviro.pdf
    • https://davaocarrental.com/images/file/wifemoxiru.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b1b1bdad1---jepewexa.pdf
    • https://ludifrance.fr/userfiles/file/xafidenos.pdf
    • http://studioassociatoemc.com/userfiles/files/35174366351.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/b84d023ff8804397d04a625b6e724408/61924219241.pdf
    • https://angkortaxiservice.com/userfiles/file/kofifofijarer.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160be8854db219---nasorolisufuxi.pdf
    • http://trunglam.vn/uploads/userfiles/file/fizuvafuwufebol.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a315c63933fe3000d5e26c3bba8a543a/nenexaxanipibajilakut.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736309ca585---79281163432.pdf
    • http://capital96.com/userfiles/file/wekutosisaderivusor.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078da5796162---kaximenofiw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=month+wise+height+and+weight+chart
    • 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_off0000ebd9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 16792 bytes
font_01_sfnt_off000103eb.bin
338d438f47e11eaf871335819f3fc2a2b8eb8faa4e86d8f247b25e6ab5b693cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x103EB 16328 bytes
font_02_sfnt_off00012e2a.bin
2096f9b3bf8046f18cb6b460fe9758b07e8c39d88622d3ea3760f9e787cc190e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2A 10684 bytes