Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b92fbaba09dc05…

MALICIOUS

PDF

115.3 KB Created: 2021-10-07 14:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f4aaf885c2daca21107797dca9056205 SHA-1: 057cc6118935a52b995f7e4a896b58055059d44e SHA-256: 94b92fbaba09dc05fe98fa84a43ec185d22b6b05013337764d9db656c6981ae3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the heuristics and URL analysis confirm a malicious link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.habitat-morvan.fr/ckfinder/userfiles/files/66285641007.pdf In PDF document text
    • http://www.kevimotor-rock.hu/files/files/71553249816.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/fesotifavipa.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210928_65151E7A30EE6D32.pdfIn PDF document text
    • http://kaies.net/upfiles/2109110352065668142o05pz.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210919_52CC25DE3A4FE46D.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/zibozatujasaluvelopevu.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/galejegubimag.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/dad38135ddc8b98b86c86d7a191eacdc/66868318306.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/gogevamakitudazadubemevuv.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/bofepitifubigokiwu.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/rojudilike.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/71t94skcdc3r4agufl21de2piu/jitufuvabumejiferinejox.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/137b5f4ab891c7fb14f2d9071c80fbe8/zobupanul.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/41653021040.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/towaxikanaj.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/wagadatamuku.pdfIn PDF document text
    • http://jbdclothiers.net/emailer/userfiles/file/supudililapodomokub.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/51784813069.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/tidagarazisokufazafe.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/11184377536.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155a18461e7b---33192477605.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614f1c501163d---roxuwonaralo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=chemical+equations+gizmo+assessment+answersPDF 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_off000155cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155CB 11100 bytes
SHA-256: 7bbb7ecae37e6027ca45c951ffd0bf0cc1545ca2b684688f6ba5d896bf5b23f4
font_01_sfnt_off00016f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18767 21580 bytes
SHA-256: 2fe2e571025857a149503deb6bad35b6b58948ca04618305ef7f3318ee111403