Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb0d40b870c1845…

MALICIOUS

PDF

78.7 KB Created: 2021-09-07 13:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90de3a09c00352a9eb0092b578f95a6b SHA-1: 654d3a046b9e850e33d8d28664e19871fe76dafa SHA-256: 5bb0d40b870c184555f99268fed5d6edd56efbbdf086760206a186fb6f4465cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm directing users to multiple URLs hosted on compromised WordPress sites, which is a common technique for phishing or distributing further malware. The presence of these links suggests an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a3b255f584---zutujutugorivav.pdf In PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/io9n0k31h3lmtjps4l8408mmk7/5342313751.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757e7b1bc20---kolidukevukalis.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ba6ce25a9---dabazuvefamaxaxanubabo.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/zidiradelarepebop.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/6228021f2c39b8c651e32561ee72aa89/66489563208.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210704001130_g8g1zu.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/bafedidarujesulanov.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/80312015944.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/62039090377.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/82619252623.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/dojadazemofo.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/0b0ac2f677cefc316efcd845dc212e20/76057017425.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/lulidutoworikunudixomo.pdfIn PDF document text
    • https://digireg.ch/upload/44575475411.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/72016052256.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/bifewiresobiwitemoduvi.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8a45c2f8a---97042828670.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/ribexedevuloraxefuber.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/43915900945.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/51867416808.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160abe71213c73---82393184742.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/6fe2a0d074b3e8c585c5452089b44df0/foniweludanejukibugi.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/24895349872.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/bakoxaludujuzev.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a059bf264b---sukomalukez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=revista+natura+pdf+ciclo+01+2019PDF 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_off0000c7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E5 19668 bytes
SHA-256: a8f548f246d0134e31045d3a1eed3fa1bced5b321a47a051f22e4b34d470ca77
font_01_sfnt_off0000fa1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1B 11288 bytes
SHA-256: 748f30ecc5ae65edc7825b89be2beea462a88d7df06789f608232df1801d1ee3
font_02_sfnt_off000114dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1