Malicious PDF — malware analysis report

Static analysis result for SHA-256 f02f3ccbffca6fad…

MALICIOUS

PDF

104.3 KB Created: 2021-09-08 17:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9c94f8a5206aca5c63755612d0d35c6d SHA-1: 32b605a869a8b1dc86307e175204e56f9b2d6d4c SHA-256: f02f3ccbffca6fadcc4b7c421dcf2a7f5f2d6b85daa49cd71296827b57b68f81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to mislead users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://serrechevalier-skifun.com/imagesfile/segagejebedojiko.pdf In PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/zisipuvajetabupilovoj.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/62271950790.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/dokolesotuwojar.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/28394111412.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/vukupexona.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/totupalu.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16130900ba9d40---bawoset.pdfIn PDF document text
    • https://nobelboya.com/userfiles/file/68992727068.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/pelip.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387ad0827bd---mikidexogivewiwugifaseta.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/votosapodejepuvilusi.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131b221526f7---13018221973.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/xutilexofurulolazidiw.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/32107538125.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/gomibasojunuwikowenebor.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/revamitaziveza.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/gatovabixatokilax.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161380cc0ade97---rariwixez.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/sutisigumutogunorugazodos.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/lezupezezunalafoloko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=health+related+quality+of+life+questionnaire+pdfPDF 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_off00012fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCD 10944 bytes
SHA-256: 6741a75be6f1e6d8f4ecf8177a997bfdcfe0c1b4495a283e50b38282580d6c3c
font_01_sfnt_off000148dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160EF 19032 bytes
SHA-256: 5bec2b2d4d69b6487b189386151aaedeefe8cfedf0a110d2cac948cc07d56da8