Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc711d3725a2d33…

MALICIOUS

PDF

92.5 KB Created: 2021-06-28 19:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4a621a2aa19b8fc7e903fb1d4521179 SHA-1: a518974293343768cb2f685f100a87e9fb5c0224 SHA-256: bbc711d3725a2d330bc36b331fc0fd04110a9c932c5fb123237a6948abe94a7e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised WordPress upload directories, suggesting it is designed to redirect users to malicious sites. The presence of numerous distinct hosts and the use of UTM parameters in some URLs indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3e1b7b0c---92596535479.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad864aa8cde---vepewafotasikuj.pdf
    • http://panda-es.tokyo/yamituki-n/uploads/files/86121125457.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924ea035ef2---fejomupevisesenasawoxol.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/0c8427591b8b050ae2b4f03236ab63a6/37657131972.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/05d36d4e50c60e1c86fc1295e62bb8e1/89907202689.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/f6dafa8d86f5898d430fbbc13c907a6a/33918632613.pdf
    • http://brette-animation.com/userfiles/file/67708582236.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39bb236da3---tobugibifipuk.pdf
    • https://gute-reise.ru/i/files/files/punupexumipofam.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c015e24368c---24893912488.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed7c2d8e72---zejemedegikanavekigeribu.pdf
    • http://bajcsidavidfoto.com/_user/file/woripiwab.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06b343b3b---48940951231.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c87dd6ef29---rifopokojafov.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/10773968902.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/5293461cce0d9ab963f1f77150687224/55269796484.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609612a66bb5d---niwajedijo.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c2d4a05a93bd1f6ea97e69e91ddd3144/48787160124.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/f015d8b78e30de06329e8a51ff55cd00/kezaresovude.pdf
    • https://perfecthospitals.org/FCKeditor/file/67825550982.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/6b303183ee79b291b1820fbf0016f14b/94758202415.pdf
    • http://richmediahouse.com/admin/uploads/file/vusegudoxokamozopamug.pdf
    • http://saovietgroup.com/upload/FCK/file/motetozaniduruboxovizevo.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/ec61a63ee0dd06d9b321a1c64f7535aa/33726267952.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/1b1ed783613143d7be4bad9c96d50ab5/52675504406.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+open+time+expired+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_off000105c7.bin
f69faa0e4c0bbc831350bda2b5a124e332817e51de0ad31b0828ad6cc28c0756		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 17556 bytes
font_01_sfnt_off00013361.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13361 16792 bytes
font_02_sfnt_off00014b78.bin
88d2c8cd4fc2cb2b5b160f700ab0d29d15f60c016b2dbd98d76b98d697434581		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B78 10460 bytes

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