Malicious PDF — malware analysis report

Static analysis result for SHA-256 764fd40fe0e4c174…

MALICIOUS

PDF

163.9 KB Created: 2021-07-30 20:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7768dd343c94fa8b4a3b20d3c42c3434 SHA-1: d163af9452bc29097e44248c0cf0dcc00ad077c0 SHA-256: 764fd40fe0e4c1741fabf4245edc9b1388d98a8878f8ab7b572d477d1c2a83be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and links to compromised WordPress upload storage, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://ketchas.ru/uplcv?utm_term=the+diary+of+frida+kahlo+pdf+free PDF link annotation
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaba0085ad---nudapa.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acde064350a---parubigusogotefutene.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ecbb014a5---watojewuwaji.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8f0edb1f0---1800632415.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160947d24e1d09---rofeperupuwarawipamekewi.pdfIn PDF document text
    • http://sun-tes.ru/files/file/fepemanomuzolezotonodutin.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/61804142780.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c42b1849---31597881115.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/rufixojimoroduw.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/reruvakediwedagobutalew.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/51102068659.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f9ffbbcaa0e---86788416062.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/5ncmaurle68opip503b2ojpjtn/didapadaloninematilo.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0652be71d79c52f233dcdc027d8b0b91/monubad.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/59f5e38320b276fc0d462843514f19be/doxajegugisulugaz.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/71806449739.pdfIn PDF document text
    • http://polkovnik.su/upload/file/95178457107.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/4728359064.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c85342c5c6---kitisetirimilodov.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/puvobipixokamigowep.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/goditiwajopalexefazikajur.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/dff4755de3eadc2b9fba783c9570ab82/fenadogamilurofiniranuwes.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a9d11e9f---vibiwit.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_off0002216d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2216D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002397f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2397F 18932 bytes
SHA-256: 47b0a53deb5eb1f89f8b3db8d458f3420c09e0158386b5d9cb41ac61498fb06e
font_02_sfnt_off00026ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26AB1 10392 bytes
SHA-256: 0d1b376462ca246babeabb3ebd912e2364e1cdcc3bc8dde394c93292e3da60fd

Open this report in the interactive analyzer, or submit your own file for analysis.