Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d7b146493904ea4…

MALICIOUS

PDF

95.8 KB Created: 2021-08-15 00:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a51bdfd23570db7e236bdb8e38fe3865 SHA-1: 7d7758a2f0295d12d678aa2344261ae0fd9be6c3 SHA-256: 0d7b146493904ea45e4e71d17762e2d9f5989349cbd76173823ec6cb256e3992
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious. The embedded links likely serve as a distribution mechanism for phishing content or further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b2efe887a60---pekefigumi.pdf In PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ef89aef45ad5a0154f19d4aeff1c2689/57168927498.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/demisuzur.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/nasiwaruwiwixilejisavi.pdfIn PDF document text
    • http://dnepropress.net/files/file/dabetikepanijabob.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/84132729203.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160897623ae116---52624083377.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608005adb4e62---lutoxalodigozumuriruku.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/48322650008.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2924b90a29---togex.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/34732383940.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c97d280a683---93989544035.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/50247282146.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cec73e6dc46---54289684507.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/62485951483.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/8dbtp7vn9igiectn3lhg2vmki1/44869316130.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/61925384732.pdfIn PDF document text
    • http://centronegozi.com/public/gejatigig.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/96824953677.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/72648a61f8ddb54c1247f9a95763b9dc/pipinopejekolefim.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7562775355da7b87adeacb5a5de18c9c/97698890088.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/fejeviwokerikosusotanage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=best+buy+tv+mounts+swivelPDF 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_off000113cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CD 16956 bytes
SHA-256: 5c3f0e90a1a9c6921cedf52d07bd344e7e679797244d7386c5b4ec7c1d33c769
font_01_sfnt_off00013fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA4 10568 bytes
SHA-256: d94b0ec702d25b3aa378567212126d0ef8ebe85b5397e8bc3bdfac41742ee9f3
font_02_sfnt_off000157db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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