Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4087145ab103d02…

MALICIOUS

PDF

75.3 KB Created: 2021-09-12 21:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db5b08cab499a75fcf49de90f0c32cb7 SHA-1: 513b97a52c428746f87767f0b4a1e7793e811229 SHA-256: f4087145ab103d021bed73b54a99ef29ab25e0c93e87386dc85e9e6d16276fc9
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple PDF files hosted on various domains, some of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links suggests an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://snoman.mb.ca/ckfinder/userfiles/files/95347471309.pdf In PDF document text
    • https://satybharat.com/ci/userfiles/files/65811112101.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/49482573662.pdfIn PDF document text
    • http://telecycling.info/files/file/zadaki.pdfIn PDF document text
    • http://runo34.ru/attachments/file/kutazel.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137af643f125---bivap.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/44221030984.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/33db832bcc6ebf8158c4d7e151cc6b9e/90210623634.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210902174656.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/biselu.pdfIn PDF document text
    • http://medrea.ru/upload/files/tirewen.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/69187148680.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/29531513914.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/85651512792.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/6137702465.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161395904ab570---bipapepugukumatiful.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/38919035822.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/zukosabof.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/fobunujarevosuwotikudobu.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/3966213521.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/85334436959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=dragon+ball+legends+apk+obbPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/20278883304.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_off0000c042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC042 10608 bytes
SHA-256: a14577389e9a4d2b16b82fc1a0f9d4986b19463ee594416a300089f9c4183a65
font_01_sfnt_off0000d82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 18172 bytes
SHA-256: fbdbc5aeb47f8f5fe3bdd7b868bb48df17a289753a783883e174579a3a697220
font_02_sfnt_off000107db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1