Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1275ba8739ee8b0…

MALICIOUS

PDF

85.1 KB Created: 2021-08-13 18:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 33c830ad58deb3e34fbec51170c717e6 SHA-1: 22f5a2b019e23a4a4bce5159698d7a13c5103db3 SHA-256: d1275ba8739ee8b0de8a139c4efb8d0e6c75a2d30cbfff95f3e1b5f1deda4f47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many hosted on compromised WordPress sites, that lead to PDFs. The presence of these links suggests a phishing or malware distribution attempt, likely disguised as a system update. No scripts were extracted from this sample, but the overall structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/111afb53fb3e8c128675a6e057e56cc7/powowovaromosagiteraterid.pdf In PDF document text
    • http://geodavidepini.it/userfiles/files/84079356978.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/72162667497.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4788845ec14f2ca661919f7f547c1c5e/nopaxigulu.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/47c1e47057a3dcdd1f57f429d642f4b1/nebodopa.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/col4l9k2jledp7nocr19dld331/tonoseratokejob.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af915489009---38405033483.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/49710761052.pdfIn PDF document text
    • https://museos.comarcadelasierradealbarracin.es/ckfinder/userfiles/files/96522657405.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/88333381465.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b42b5014379---vurimozisolotiwabam.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/90196424431.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/4u9s8ppnheare1p4rbefugu9fv/1396744021.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210714062219_spgf8t.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/79257466122.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/tikukuzasijivinuvamepik.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/fbfd21536cb672c79caf80c0a51a47e9/57618803944.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/wotesukiwabilinotepoxoxek.pdfIn PDF document text
    • http://cuacuondaiphuc.com/upload/files/pajewabiditobatovak.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/murofinomemimezivavola.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/mopujesodajokuxotu.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/2359f0ba6b0ecc219d907cd5c70baa00/lofunizuxabubupudotamipax.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb57e6eb7---38109764761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=android+system+recovery+3e+update+zip+downloadPDF 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_off0000e7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A8 17004 bytes
SHA-256: fa84c3dc6e367b74f71a39c7853e29ddaeff8679d3574d07440dcee47cca33b2
font_01_sfnt_off00011435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11435 11256 bytes
SHA-256: 3ba5da6dc0d3479a1e33b559a82e9ffedb017598fb7e2ae49e75d1d9cf701f83
font_02_sfnt_off00012ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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