Malicious PDF — malware analysis report

Static analysis result for SHA-256 e10bf34baef515e0…

MALICIOUS

PDF

82.5 KB Created: 2021-09-23 06:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e7b9caa36cfcedc56c2ea7a9ba5a212 SHA-1: 2e8a3e8920cb05323b8ef01507b2f3af36202116 SHA-256: e10bf34baef515e0d34ce464133d951be44f5b9ad9e4ba460a65e6367f8e92e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=best+rpg+turn+based+android PDF link annotation
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u0v4ln4i0u2p3ddalcvrt74gb1/zaxozezutolev.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/72203310710.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/66344783124.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/xofiborarufigoj.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/vezipamalobozo.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/32571117401.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/3457548519.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/23280436468.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b29340d928---lotaj.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba47a51aeb---87096316633.pdfIn PDF document text
    • https://avflash.nl/upload/files/konutariwus.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/32756177493.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/42344752511.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210916150602.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/99029606515.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/39422988825.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/99621396699.pdfIn PDF document text
    • https://activepymes.com/pub/file/29623961113.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/giloxezuzomajesoga.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/dupexapiwizizezi.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/65375140892.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_off0000db2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2E 10816 bytes
SHA-256: ed4badd8ba9596189575ecb319c0c3693da1760bebaf3ed3a1efb46f225e009c
font_01_sfnt_off0000f3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 18568 bytes
SHA-256: 76d6147cf0b00b014189716d67ceb80c4c9afa6edaf8f32bdd1bb09d01d0a79b
font_02_sfnt_off0001245a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1