Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbf49b72d5c0a1e…

MALICIOUS

PDF

163.2 KB Created: 2021-07-21 08:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6fdb11d969ee024694bdb4704edc457c SHA-1: 90cb032b2b3b5ea55622085750472f8d8d757bb1 SHA-256: 7cbf49b72d5c0a1ef28cd7549c23b7f2e4a08d6b8d910e7148b8f2ebe7dd8f47
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links and the overall structure strongly indicate a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/660ea4a3a53f58c893e297df1893d377/ruzupukevovu.pdf
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/43318350970.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091abbc08114---sixuvaxugabexuwo.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dedd814a30---zagidulefevudupofituza.pdf
    • https://rainbowfurnitures.com/files/files/bulukerobebilinigure.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe25459b34---86695779177.pdf
    • http://guides2alpes.fr/uploads/file/21733254357.pdf
    • http://fatamorgana.fr/uploads/assets/file/37153607324.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb19000962---28412275158.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/prinajcnepp3s01g7bf8bv6bn1/96007492698.pdf
    • http://aisef.org/uploads/userfiles/file/file/39423311360.pdf
    • https://daxitrip.com/basefile/daxitripcom/files/gulokedovukerefenojetofof.pdf
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/wagekuzotozubegus.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa270988573---47459021710.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae1e48d490---75227145603.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/19e42d8af4b77129ea144e711656fe3f/93444552222.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160863c48bc97a---7934922240.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b8481b45cee---bolikarilibexemizuvo.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776c289833c---dufefovixifimawujigo.pdf
    • https://hkbca.org/UploadFiles/file/20210527164420178.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079ba23d3472---polukomopinagi.pdf
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/4010865705.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+is+a+scholarly+peer+reviewed+journal
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021a5e.bin
13606b1c47c8402ea8c6c6e4aadb0e6dec90602bb0ce77372b3a8586c0659211
pdf-font-stream PDF embedded font (sfnt) at offset 0x21A5E 20004 bytes
font_01_sfnt_off00024da4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x24DA4 16792 bytes
font_02_sfnt_off000265bb.bin
b801f7ec1cb41a452920a35dbf910d3f0f964bef6ec8d72d677c60546c8c4653
pdf-font-stream PDF embedded font (sfnt) at offset 0x265BB 11100 bytes