Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d4390230da63cd…

MALICIOUS

PDF

96.1 KB Created: 2021-08-15 23:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2edec1b2ce172d43d3e95f78b6fce99a SHA-1: 06b6b6fe2ea56b0e8beb29fd8cb03c49a26d87bc SHA-256: 75d4390230da63cd30d061360d9bbf0f28301cf8f84ccb80f7ade95ffb7026ad
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to websites hosted on compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings and numerous URLs are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/rivuletigi.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/636b1c9165a74d87e95cc45b6cf7577d/wudezomutodide.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/98938475237.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/79761199358.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/dtut0iom3h5j9c7fqjtrbnivq7/tejalagatawexikudijo.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/66443071374.pdfIn PDF document text
    • https://tomas-music.com/contents//files/92443582471.pdfIn PDF document text
    • http://merwepizza.com/upload/file/doxukosobomuduwuvosimego.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/60874436944.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/47823388241.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce9f0e271f8---gebewogidufizukotumen.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/45745104614.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092446a93830---xajopanelutepobodim.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/deganowogikilemaxew.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/8881932485.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d67c079fd4b---jiburuzolexukitasive.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ae013916a4e---sosofobizekozubepefi.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092912a9ebe8---50003255082.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/0df44704a01f66db77d673e4c8168e21/7885150586.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/36360563365.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/49756405302.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/399a1b16409dd29bfabad6b834625a99/68110105698.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae9bd7bb14---84928682631.pdfIn PDF document text
    • http://poiskvod.ru/images/file/togewegagenudexarogove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=t+fal+grill+optigrill+xl+gc722d40PDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/19823606884.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F79 10824 bytes
SHA-256: 0d78a82e936447b294744af38bbcbff2c004ef0c255e58efa6b5e873c01c5093
font_02_sfnt_off00012872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12872 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
font_03_sfnt_off00013e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E96 19036 bytes
SHA-256: 1c172403dae014841846b32b9671dceccbdeae7a4595f3067117b995cf372b33

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