Malicious PDF — malware analysis report

Static analysis result for SHA-256 581b3ccb2c8ccdbe…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 21:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d514e1dbd89fb927230b1f08060b0954 SHA-1: e8dc232e5165dc7d25a68e31e568cc1109e856fd SHA-256: 581b3ccb2c8ccdbe2c7bfa7d14b5bba52d9c10681fdf1e259c291db16d8c3052
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many of which are hosted on potentially compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded links align with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://valserve.in/web/k/main_admin/ckfinder/userfiles/files/88758535286.pdf In PDF document text
    • https://motodubai.com/uploaded_images/files/luderudedera.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/doreviruxejerotosobenuped.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133578bdc23f---badatizuj.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/34627984421.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/nasaxuvafokasam.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/16460760417.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/gufox.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/dabigabijefuvibuletemine.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/4517247110.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/mufuxenuzumuzuwu.pdfIn PDF document text
    • http://vo23.ru/upload/file/69548347164.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/momenegixulufilovimew.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/zasonexewat.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/24316208948.pdfIn PDF document text
    • http://scro.ru/pic/file/kemumilumiluxugazukofu.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/256bpqd10vgekkgi4stpfibu32/denijele.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c4f504599---21059960651.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/6775865407.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b95d29c57f---navedizopovavoxiziwepibuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=inbuilt+vpn+browser+for+androidPDF 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_off0000db7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 17480 bytes
SHA-256: 07a868430658652a4a074f99da00e0a7da0c040613de1892c28b5aced59b4349
font_02_sfnt_off00012126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 10832 bytes
SHA-256: a0b2df786d7365f8b2674d778e4761c48af2d3ffb5a2110a8412c7affa7847ab