Malicious PDF — malware analysis report

Static analysis result for SHA-256 2252d83dbe278f41…

MALICIOUS

PDF

89.3 KB Created: 2021-08-04 03:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a376ca167f25bfd7dd5171c6ecd2e086 SHA-1: 98fb86733896783ee7ceaf1c7efb809e2e673e31 SHA-256: 2252d83dbe278f41820d80a7dcffea1a88762c7409712932baa9be2645ae5d30
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan. The file's structure and link distribution align with techniques used to distribute malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://bpsstudio.hu/uploads/33392046745.pdf In PDF document text
    • https://vegas-shop.net/uploads/files/73333029086.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/3830bc1da8c289ca9dbab389f66a18dd/rulofotaketenix.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/38432133538.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/gsqd8ps0mu0d4ljd8849asd4n7/nisolarimem.pdfIn PDF document text
    • https://efnnma.org/files/file/25995917033.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/5087906593.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/70760886035.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/gimikowunurivikawuru.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/jijuzozu.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/nenivegatoto.pdfIn PDF document text
    • https://tonitomov.com/picture/file/50679050318.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/povon.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/gidafitifirogasimebuta.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befa3a41872---jotagez.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ffdea3373---muvijo.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/wawemetomixutulilibi.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/savebi.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/f363908bb2330e9a489e28bc50eac780/dumodogesazal.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/luxirulaletaxebijim.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/tofawotazinowe.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aed6f3dbe---3829479414.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/21710268512.pdfIn PDF document text
    • http://garderoba.sk/images/_file/javokerojo.pdfIn PDF document text
    • https://medtek.vn/storage/file/xukejoxuweboxoverexawugib.pdfIn PDF document text
    • http://izdepskifamily.com/clients/1/1a/1adacdf247316bc4617b3617d965acc7/File/raguradoninewajimafamivu.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/nuwakun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=is+the+barden+bellas+a+real+groupPDF 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_off0000f8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B7 17500 bytes
SHA-256: afd4f626edc0c6364f3b813596699ac068d42ea44371f9926562afd5d3f0643c
font_02_sfnt_off00013eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECA 10768 bytes
SHA-256: 075335e0601de53f3c283a80fa2854fc5f673e73822354f86cded2513b60d4b0

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