Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a643afdd7ac5ebc…

MALICIOUS

PDF

127.5 KB Created: 2021-06-26 08:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: efe2c33abbaa29497726d18fde752fc7 SHA-1: 76b46b77f12c52b81c2347158c62b68ed0235cc4 SHA-256: 0a643afdd7ac5ebc9afde70f4d09d57fc9b38e8bac2c0e992edb068164b393ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to phishing or malware distribution sites. The presence of external URIs and link farms on disposable hosting further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cructi.ru/uplcv?utm_term=find+the+source+of+power+in+dragontooth+crater PDF link annotation
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6401480b0---80466921239.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/mezuwofelupapotuxo.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddeaf097f6---masosebifulafo.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/7b26aed6c546202388046ff661cb99c4/85637350927.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafb83ae7e5---zefimubunufuwiliputis.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a563ee235---17560883921.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/ab49054919d929942ae34513c31d56b5/wizura.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e3f3b4bcf840daea8ce1224e1a700f53/gopuwenetoputaj.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b22fa6a53aa---nasamikobobuwomaxalugag.pdfIn PDF document text
    • https://triosms.com/userfiles/file/14621527181.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/vixavobe.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/kotitaw.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78583895613.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/mupuzu.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/a0b56svkus8athh8blhkmg6m39/raxojunewapirasomivoxa.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/gopamuzasumax.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608415a1145c7---18378580672.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/441147705eb4c97b1964c3bee8009957/supav.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1211ad48e---xuperusuziseximanepuduguk.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/rhrq9k5tqh1kfjg5olsc9c0950/55849391095.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/tupizo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F09 18592 bytes
SHA-256: 435a66d4804a12dd51bdb9f1e77e1aebfa1a331da962841cbdf103979f3fdea0
font_01_sfnt_off0001bee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEE5 11016 bytes
SHA-256: f82512bccc39abd22bec5513425fa9f59e81f405bbbe00defbf1b1a33d0a9603
font_02_sfnt_off0001d850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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