Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e648bd1f1a4774…

MALICIOUS

PDF

85.5 KB Created: 2021-06-29 01:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fc5bccf3fe2d33304baa7c03ac89cba5 SHA-1: 1b25f09c5e92dc59e20c518e88160a754eeecb08 SHA-256: a8e648bd1f1a4774244309a94815dfc1c98d675ce773875cd5f026d96af5c03e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm, with multiple URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were extracted, the structure and URLs suggest the PDF is designed to lure users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/e9c96215e9532b9a432e62bb51972216/xulalifememazonoramosu.pdf In PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d84f05f312---vafumuresu.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e71620bc8b---nigufeduzum.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6lsllulju7p3b4nfsq94arutf7/baridexewide.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/3e489e84b27d1c816b77d4256804fed9/99989542860.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d99c8d1faf---tufuvetewilidususav.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/f296e2b72098ba1f1e58e32fe80c345c/sovikikesowelutebije.pdfIn PDF document text
    • http://esejsc.com/upload/files/gemefezema.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/xinibuvumijakuru.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160782c2a72d25---dititezakabij.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/76dcea4667e10be336711a54e663ef00/bavanij.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/36970437025.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/dobadupagirapunanatep.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/c6ib5rpbpcc29jgefn7ebeagfi/zevijefebexuwufa.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/i5c117gq52gs4u585jhiviak7m/jexutolusefulu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6528f1216e---titopugesiperazowezuziwu.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3lhd6995q48m9tlat9d322ehd4/xafegafepe.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210614072701_3hkdaa.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/19066573007.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/gafirilum.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/34732416126.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/segazulewugafivife.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/f0053fb7675a391714c5776a12644400/pimozaxiwutefepuloneboxus.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/39b36d9ba83753ed211dc4be54de6578/tosotavavoxareserisit.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/borasenetaroxowix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+long+paddlePDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 17340 bytes
SHA-256: 3f505d6c8fa40ebcb55c46712fb54f819f221813fbdd5478d2abb6d612036645
font_01_sfnt_off00011a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5F 10176 bytes
SHA-256: 0bdd7948378757cd2c1a25f6637b5ee1c418b1de4f19711e1d8bf26a973e802d
font_02_sfnt_off000130dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1