Malicious PDF — malware analysis report

Static analysis result for SHA-256 352104242092ebae…

MALICIOUS

PDF

78.4 KB Created: 2021-09-02 14:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b3c0b308dbb710f984f4196727ea5067 SHA-1: f7fec0af6429fead3f4b915aeee90bfdbc5ee0ee SHA-256: 352104242092ebaef75730335ac04a0d2f8cee0253bb46cd7f4ebe4199eb63b6
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and content are consistent with a malicious PDF designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://cructi.ru/uplcv?utm_term=recetas+postres+gourmet+pdf PDF link annotation
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/44c6a7beeec11b1e9de5866800dd0784/limojegunimupeve.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/35f21f66606d07537ff2b92c758173f5/ditomuxuduzubojixolupagu.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/vakajiwiwa.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/pugonefip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2d4010702---10124015145.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/71190731663.pdfIn PDF document text
    • https://ccskin.com/geektic/files/ziboxototupetogagowobidi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/40dvl3emhnq8otnhm7pe6pdl7o/21712193655.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/nexuvekukafadawibukis.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8afc371d32---tixajubulozezudor.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/61217380069.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/42503457899.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d07c0eabdb---60297681937.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/siwuno.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b27b6960cc5---90388264259.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/jasevepamanewe.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107ac8bd821d---39558199976.pdfIn PDF document text
    • http://belovosushi.ru/files/13073554068.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/ec8d32c97a63faded79254f039bdcf9e/pepoj.pdfIn PDF document text
    • http://ecole.ru/text/images/file/69832557874.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/nomudutabinabedebu.pdfIn PDF document text
    • http://timesofbangla.com/uploads/files/sabitim.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/mulusozebuvuroramogade.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/550c83508ac7171b857d6b9c91b369e3/82840847418.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/befepasi.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/89189842078.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_off0000cd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD24 10868 bytes
SHA-256: bb93c1a6f7ec9c50d97abac341a89644cbabac2d7979f5e1224490109c1856fb
font_01_sfnt_off0000e61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61D 17860 bytes
SHA-256: 992b9d4ed73c877cf4b1859bf122693af7fa37299ec50baf42c7fd48468fdde6
font_02_sfnt_off00011400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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