Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9dbff0b6bb1d198…

MALICIOUS

PDF

68.1 KB Created: 2021-09-17 22:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c226e4d26a68a233d491e03c6c6435a3 SHA-1: 0875551f20bf09fcd9e019f95d8b53e5bc8baa0a SHA-256: b9dbff0b6bb1d198147fa42984bc090c24f5eadbf7d6e495c3ddbec2569b7f67
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing campaigns, designed to trick users into clicking embedded links. Multiple heuristics indicate the document is part of a link farm hosted on potentially compromised or disposable domains, aiming to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links strongly suggest it's a component of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://tv-sat.cz/userfiles/file/44063971227.pdf In PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/gevesepazuwu.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/59815832694.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613aad8ac4671---nefokokatorijokosut.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161341dc88f4e0---wowiruxuburadopumuteniso.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/loguparotigokibog.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/62118420763.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210913190957.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/ligevizidofefimudurap.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/16097285794.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/zumurekuvekafopivuz.pdfIn PDF document text
    • http://meta-min.com/files/17968975718.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210903115126.pdfIn PDF document text
    • http://farmina.ru/uploads/files/43734006257.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/risibakadakiboderedejited.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/9226578170.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/fupavusivexu.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/16782642985.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090715192273499.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/57768182330.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/10064303397.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/23262669736.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dea507de1d---fovipexuwe.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/49449195310.pdfIn PDF document text
    • http://wirheiraten.de/images/file/74654444311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=csm+rubber+propertiesPDF 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_off0000b19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19A 14076 bytes
SHA-256: 6d33fe6f2a0e5dd0ff2925bf0636ac5ea2a06e38000e4ae4a21dd60366d903c4
font_01_sfnt_off0000d41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 10372 bytes
SHA-256: f4d500f06ceab6d963e07d6f24fa2a2e01ccc57b3833232f8e1c359992f55572

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