Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9ea901de72ef83…

MALICIOUS

PDF

90.3 KB Created: 2021-06-30 01:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 469bffac55fb51485591ca69dce2661c SHA-1: 31a319d0effe49fe305aa81b55563cfb04dff802 SHA-256: 0f9ea901de72ef83c4896764f8c4b1425399b45cebde52f10cf178d07237bf29
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier strongly indicates maliciousness, and the link farm structure suggests an attempt to redirect users to potentially harmful content or for SEO manipulation. No scripts were extracted, but the presence of embedded URLs and the heuristic firings point towards a malicious document designed to lead users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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 http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0f5b4a0a4---814204660.pdf In PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0760c22684---bovilijuzofamiro.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f09bc76f74---vovupiramasikomujalo.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/2a7fdd1b8081037ef3ba1a4bd6318412/ledox.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/suweregukefexamo.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160824759cabbd---78639303354.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/21657612980.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/mifiwajibirerowinewo.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/setesesiworesu.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/8a1755066454e3ccdb8d35a3f913bd9a/sovegexefufobowilul.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210609075143689475cyp5wu.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/71967716607.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/71477247934.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/98bf525ba5b212b83c2455fecf720ed1/73834546497.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc0aeee1aa---zixoranoko.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59ef8b6e48---42077753456.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1dcb108bd---51928644840.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d3fcc9b00---10857499254.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/29694076100.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeca45df84---64117518463.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b96eb4914f7---namizunezafupes.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/a1eec46fd69b786b75ad2eba8859bb61/72714373477.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/k3s1l8aje36017bcrv7a4sg4d3/10318941202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=traffic+with+omar+eppsPDF 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_off0000fa52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 18276 bytes
SHA-256: 2b39f7efac3b0e76f724b42282dbffda5321a22efcd293f02b1a227e6f73e5ea
font_01_sfnt_off00012a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A32 10644 bytes
SHA-256: 0a301dc84a19f26963d82c4a68c1953e5a43da41714def5699bddc1c1ce706de
font_02_sfnt_off000142b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1