Malicious PDF — malware analysis report

Static analysis result for SHA-256 f347a85f8e7486bb…

MALICIOUS

PDF

82.7 KB Created: 2021-08-31 19:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4c36ebdb4defd412e07ee933fea7977b SHA-1: 2b3edf7e6147a309077706a93f4a862ddb96a97c SHA-256: f347a85f8e7486bb662f54eb9e3f02c256ca40d0ca9356ee9e532e876e301ac3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites. These links are likely intended to redirect users to malicious content, such as phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160afb510b53a0---34805149913.pdf In PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160721b9d5ad7e---jomajelizalatoselu.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/07bc80d064d27d176531f66181b6adb4/karazururudajupebipo.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083623c288f2---10454607203.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/lowosifuxefixelewewi.pdfIn PDF document text
    • https://digireg.ru/upload/43418319588.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6af3ec39d9a2ac09f66d22c4420325a7/baxobosowavol.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202108131419208499.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/kugudovugowogatumamalagid.pdfIn PDF document text
    • http://brlairport.com/images/file/91043118784.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/rikuba.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160afe1f84a26a---4731985881.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/putavefutesatozaburor.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2d92f1f968877037dfe22dcb6249ea2a/momimotowosoroxow.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/7995794171.pdfIn PDF document text
    • https://tangente-mag.com/img/file/91035196358.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/4fk8fi5f1npddgf845eel9h3dm/xobujefotu.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/3060bda0438577467488d951539df181/43442520894.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/zavupajigomakugilufas.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910cdb92cb2---4896533218.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160818d0d9f98b---suwuwabi.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b607017b3b---77405159959.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/279012135.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/golagasupifezokexijekar.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/47543808175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=meaning+of+dream+girlPDF 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_off0000e2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 16844 bytes
SHA-256: 657f933dc443772b66ada7ba80c5f74e8b3f2f21bb12998d61bfa3ba588a0e94
font_02_sfnt_off000125aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AA 10424 bytes
SHA-256: 7de0113fe3434a2e224e33de66b504b947ed1c1cd2c426f401f3b740511e4873