Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5e5a770ec3be8b…

MALICIOUS

PDF

73.3 KB Created: 2021-09-02 02:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 83b6757f57da4e9e0c290c11649d0b58 SHA-1: 05f61e2a8576150fd8edb7809692440ebbdc3813 SHA-256: 8e5e5a770ec3be8b803aa7a919c9d12e984343215a6183a435a8c4b9e0b330c8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of a link farm on compromised WordPress upload storage further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tubesealer.com/uploaded/file/11748614666123e5188f667.pdf In PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/vomaxetokuzozu.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/fetiliwefajedazekoduk.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/acda59b4f34329ddcbbe07ad5ab58c10/36540988044.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/48248724153.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/zidibozukusomovaxufimape.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/29230730910.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/q5ctqaulmq2udrnr7qkju55em1/47014122081.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/it1hrlcbhnn9mp386lavu0nhi1/42598132552.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/nirabibali.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f9ff47256f637b86eb470ee253583bec/96684686413.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/79519555277.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/28521870575.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3f6eb48b2---32997235578.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609844a47ff94---pufube.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/8832644910.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ucrlfe7vsds9dq7d522p7al700/kaxagutugusuno.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082889f97925---17647547181.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/zupefemagitaruzogij.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607e34493a5d3---3669878814.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/5188ab3e111301c8ab5753724d578221/zunanam.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/5161d5e7f8146f5754b809bdd8a13078/lifibo.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/25738811624.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/zafinitizewutejuzekogin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=free+second+hand+itemsPDF 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_off0000bd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4B 16500 bytes
SHA-256: 747fe446465a316b4f60955b247497513cdbbee62f40881daf327726dec31f79
font_01_sfnt_off0000e7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 10564 bytes
SHA-256: 2879a7b8ff053b2e0ca09b90b6e8f5bc1acfcc53b69279547ffc95e36accc7d7

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