Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b1f10afbe08e87…

MALICIOUS

PDF

92.9 KB Created: 2021-09-19 07:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a8e920b91956d41a06205de15c734d3 SHA-1: ded8ef275df969577226acb3bee10021239ecf11 SHA-256: f2b1f10afbe08e87cd79f6c5b91ef6404b9dcaee386a7a386c945d29e95bfb44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While 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 0.9977

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://n-vv.dk/userfiles/file/89395563590.pdf In PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/u74ta5qa7fca63q7g3qvqm8791/defozaras.pdfIn PDF document text
    • https://campermagazine.tv/public/file/nisemanila.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/69931352344.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/6267423781.pdfIn PDF document text
    • https://dm288.rs/slicice/file/vorunodamipageniruv.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134733a80073---bikobisinipig.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/mitasokolafavibeb.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/33114168955.pdfIn PDF document text
    • http://hybsch.it/upload/file/nuvusepidagadigepixe.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/34314476822.pdfIn PDF document text
    • http://teakdeck.pl/files/file/35343636121.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/13316985770.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/gufefupapilebelixi.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/kupotudeb.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/15021a44c638b1ae144c26bf4f9f2281/15650258460.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/85371822009.pdfIn PDF document text
    • https://bczenekar.hu/files/file/48758243156.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/konizarabibub.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/fitulenozavipowedi.pdfIn PDF document text
    • https://ikansambel.com/contents/files/rugomemajuvedo.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/winetoripan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=objective+pet+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_off0001043d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043D 10272 bytes
SHA-256: 71c3fbaedb3c1a77b0bc3087a97681c383c196134d1f548cc31ea0f7cf3d1ccf
font_01_sfnt_off00011b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B47 19272 bytes
SHA-256: aeec7bdfdb0cd36320f23f5e1467a2e0e91c73447ba340bb3403e59407e56639
font_02_sfnt_off00014e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1