Malicious PDF — malware analysis report

Static analysis result for SHA-256 507e93467da6c493…

MALICIOUS

PDF

111.9 KB Created: 2021-06-27 15:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2921112a0793397e452c38d433b81310 SHA-1: b3a1c5e7b91395a2e580b4f829138008a9df72dd SHA-256: 507e93467da6c4933c39909aa30506dd934460207fe5fc5164e38b1d6a5e0939
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/a405ca7ed410000884b17a8eb2e602c8/13308836065.pdf In PDF document text
    • https://eyetracking.pl/userfiles/file/38038443320.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b08565702---48711646432.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160845698dd732---44607996454.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d3078f2568f---subezevu.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/zavupufefuto.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/3f61d6c6445a452d2ef62d4ee94958a3/gufimewejux.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/88iqerqjr45d5tova19sli4vu1/pidumuwaravi.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/7f33ecf78ad6fd7d6c44a7bf059e291f/napowaborinizukovitegobun.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160845c4b735f8---76165567797.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd07d341aa---60156053623.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/19383952275.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/esj6brg5eeh2995jh829lou9m1/tolewit.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078da08b769d---sidupixetogowa.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160904598e9005---robafasimupovasutemo.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a93bc87ff7b---43155784385.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/megil.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/15b236d6c7bc17a8f61b3dd05a0adfab/pobatimitunobulekutir.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4bc1ed94a---36680833730.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b19c1120ba0---fowidivobosowinajiv.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a49f6330cee7fda9403f672c8de98e5f/mifosu.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bac1c61fb21---85996971429.pdfIn PDF document text
    • https://aashianarealty.com/file/wodebisopoginibalozoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=flute+is+a+wind+instrumentPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8B 22336 bytes
SHA-256: fdf7915585c0ea008bfe06da9c80f4790f49aea81203be6bfe8f9fe1787f3971
font_01_sfnt_off0001740d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1740D 10452 bytes
SHA-256: bc6d1449d3b6c74b88b7e6173c35963a5a1538a13b167b1896197599bac468c9
font_02_sfnt_off00018bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001a3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3D5 3700 bytes
SHA-256: c1c658016e8f7c0f22c3517bc3a9a7b692a0556eef1e57e86ecea7c7ab786eed