Malicious PDF — malware analysis report

Static analysis result for SHA-256 23fdd5424ab06b70…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 18:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ca8f4d78fa44d212e9052d4c7b946232 SHA-1: d3036c2b580fe0214c56cd321e3906b61c77c7f8 SHA-256: 23fdd5424ab06b70c226c5dc01399e4ec56973fcdbd3b109b87f32605d2148b3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The document's structure and embedded links align with techniques used to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/7d4580ea4b244fd4c4ec3c532f93ad43/10829729575.pdf In PDF document text
    • http://goldmustang.com/files/files/gatupatexopawi.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24c1d1a361---gilulorakifidukiko.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/favexowinulebobolibupiwis.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7044bee7f---86610018152.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918204170e8---71252322349.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f41b0fc29---40854493473.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959ddc1351f---44527311792.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/37377435906.pdfIn PDF document text
    • http://ativn.com/upload/file/dikeziv.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/79779155257.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117b18f568cd---79871693020.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/toporezutanumiv.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/73061877012.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb47b31a80d---vibuxazujegiridepefiga.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/56142834364.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/81728835953.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/47790223070.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/naglgeo5t4qt9b73m2kkud43gr/47761310576.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/tofabesifovulowivef.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/19465333834.pdfIn PDF document text
    • http://didopack.com/files/faxevuro.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a3ed3951069c15673e86a94b9a507fb3/temiro.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acd647e8c0---77156703581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=kia+picanto+service+manual+pdf+freePDF 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_off0000d043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD043 10936 bytes
SHA-256: d0bc67f395b38b3ba587e778a36dfad6ab311f20069b3ac5d226ab0c8a9cca26
font_01_sfnt_off0000e9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 18592 bytes
SHA-256: ff36b7ce7332be6db6026b05d251dc85dac5154291dfc024e693b4f6603cd945
font_02_sfnt_off00011a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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