Malicious PDF — malware analysis report

Static analysis result for SHA-256 b277f8bf6952f747…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 07:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fb7c212b198feb60ab69845ae65afe10 SHA-1: a83eed05d1108b8d5051cb8b61e6e15b0521e136 SHA-256: b277f8bf6952f7473d3d19b1d86082977729ca612dbdaf5fef44ff156551eab7
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous external links, many pointing to other PDF files hosted on potentially compromised or disposable domains, suggesting a link farm designed to distribute malware. The presence of a 'download button' lure further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=harry+potter+first+book+pdf+download PDF link annotation
    • https://bisnismedsos.com/userfiles/file/82003242292.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/32165332154.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210904_9101A90199E370CB.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/52052749213.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/12930337222.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/35673581547.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/noleporebisas.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/niruvudivugem.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210902100750_1685255503.pdfIn PDF document text
    • https://rosycaffe.com/file/kimeruvuso.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/66297755712.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/fokemokigekite.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/padukoked.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/mapukemobubutogegos.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/jolokitopofuvet.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d411f29a8a---gerejokobi.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138f1993149a---dufeb.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/99552903050.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/zanelovazolabizosutite.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/kuvokawexiv.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/livodogugorowixib.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424b81415cb---57424898455.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/80278345308.pdfIn PDF document text
    • 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_off0000d461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD461 18344 bytes
SHA-256: 40f6e865bf8ceb650884f315778ed3f01370bd5127b1f2e8220800b9be4eca57
font_01_sfnt_off0001041d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 10912 bytes
SHA-256: f940372ae17e8454090bbf5426f896a19f951a9bf8e5786edb6c2d73d9811036
font_02_sfnt_off00011d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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