Malicious PDF — malware analysis report

Static analysis result for SHA-256 f331400f6770d4d4…

MALICIOUS

PDF

103.8 KB Created: 2021-07-24 03:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 211b7beb06b3ef3c94c7275d96e49ee0 SHA-1: 6d3e2d3e854d3ee89004488028aa3efe2eb32849 SHA-256: f331400f6770d4d483d5f2e053c7db5adcb43ea5dbbd634288ba674db9ef8b55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple unknown PDF files hosted on compromised WordPress sites and other domains. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9857

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://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e48c7216a---73732215183.pdf In PDF document text
    • http://didopack.com/files/turopimofagulovixunidibax.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/4b9d56ea7f76a4742606b2bcc25ec823/81711021389.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c9290ed4a57---fodubevujisatirov.pdfIn PDF document text
    • https://museos.comarcadelasierradealbarracin.es/ckfinder/userfiles/files/39870226978.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/90617817836.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/popugo.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/68940254071.pdfIn PDF document text
    • http://www.asslar.de/downloads/56724963996.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/degebobil.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/diwegotulozeguj.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/86tlshgdan3risaeqnn6manq7c/33290093930.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/2919f61decd5c603c229acb1f067bc94/nubopoz.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/56c972f81d7b2c20c1b78cdf67f3ccbc/gubezawiw.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079556d07b5c---90605810781.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924298ddd08---93466716641.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160abfc034188d---rejakufetizubusekikep.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/7c902684797f18a8bb53c850414434d7/rojugoga.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/36076356286.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/72917178347.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5953f3713---44498297074.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9dbdad9f4---39401989164.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757687ac7c4---fekilovagisuvejozikuga.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/tubavadokug.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/82e24e05fb592e6864530616489a28fe/3803166948.pdfIn PDF document text
    • http://maihome.hu/admin1/file/90128665911.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/mukejelevimusotife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=garena+free+fire+mod+apk+diamantes+infinitos+descargarPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11024 17952 bytes
SHA-256: 67ecf6c43f3a526eb7759082b130af36ccf448dec02fd5bf1973611eed6df0a3
font_01_sfnt_off00013e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E37 1672 bytes
SHA-256: 3f1748778f03e7b7e2d3a6c88ca15ef060a02f224cd71155e662fde9dd4c56c7
font_02_sfnt_off0001462a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1462A 11048 bytes
SHA-256: c014f0818ba4790088f416bf7029e1174ac4cd2c56b337d774bffbe033af6997
font_03_sfnt_off00015fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000177c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177C6 16204 bytes
SHA-256: 2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489

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