Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f21fc39a39d687a…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 22:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d2cff83a2f9b30c3d56e37b03ddf0cc3 SHA-1: dbc7b84e68bf053bb8be5081f1a03cc063493e51 SHA-256: 5f21fc39a39d687afc06108a5c7e4701b0d1189fca3e128254de12b5c2f5cb7c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier assigned a high probability of maliciousness. The primary function appears to be directing users to potentially malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pistant.ru/uplcv?utm_term=el+origen+de+la+navidad+pdf PDF link annotation
    • http://msslink.ru/userfiles/files/53316913411.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/wotogabawenego.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/71u5gtrtqj6n7sanjn62svqvc1/tatitonosigojupo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161239a256676f---wajarukijulamerunet.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612194d924c43---2889927464.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/f0a1709588f2779303610199c210865d/lawolorineliwepulozex.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/46021615494.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/nevalakizutuwunegemozob.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/5ab36c66d43daa74df94f8c9f9b9cd59/68946532532.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/f10d0a706f0f65bce62c238ce20aea33/filegizikigezegudad.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/85404121987.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/zuvoraguxutunogosupetejiv.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b3c2c162e---13562895185.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e5659ab3e---11951883264.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/cf44304d5f3d2c062855eb20c7583b96/49897880753.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cee42955b5---38583872429.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/4cec30566a2221e511962ecd706192b4/90043184275.pdfIn PDF document text
    • https://mcrlclient.com/ckfinder/userfiles/files/44493727924.pdfIn PDF document text
    • https://digireg.gr/upload/fagaze.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8e4d044c3---kiweximerimosowezar.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/32187555d61ca4b4c2ae9c3ee11429a3/55373720733.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_off0000debe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBE 10456 bytes
SHA-256: 931c34f75b5f8edbdefea70ac92f93a91eb2bd6a91071648a3762cfa62a42ec7
font_01_sfnt_off0000f651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF651 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E63 18800 bytes
SHA-256: 487aa158c1110bd39dc8ed2e224d7de80b0d03d318c835fbb232b292c95914f0

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