Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ecff78a01473ed6…

MALICIOUS

PDF

137.3 KB Created: 2021-07-31 01:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9046ffdbc65f796f7beec4a92337633d SHA-1: 15a691fbe900b0ded51ddf520825f6e392138040 SHA-256: 0ecff78a01473ed6138357bb414e1a7c4ebf19f11d3b5e3104b85b436f4ed25d
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and content align with a malicious link farm designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://catamma.ru/uplcv?utm_term=chambre+d%27hote+annecy+piscine PDF link annotation
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3bm4njsj3cu9956ffl05ehrm21/61218424884.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3ea421caf---19783022628.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/riribol.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/74643554650.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/gomemiliwi.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/6cho5dpf74uac2t9jm677b1lk6/renix.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e8777cb24---64048295586.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/2fbde3166dd6717125c6900c291f31c2/87127102274.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ddec07608---ginijikixenomijagilu.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/93836570329.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4adc79fbb---xotewag.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/dta96d8k1jvm7jivjv8l8ltd2a/rasawusa.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/dakomexupisokale.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/4644567593.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/jogibugezus.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dgqhga1icb5rvb44re8bifsi05/17461389163.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/085dfbd43147e989e311892f41243dfa/zokogixuxotawolusatazire.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/pexibamojikomekivi.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/qv7o9eujeht82qshrunm8bjh74/34237751587.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/58456411422.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/3cf80634f5e9e11fdbc71f699c540a74/34639590579.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_off0001b2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2CB 11052 bytes
SHA-256: ca10000d03319af6564b7ed71b478ae074231b8b1862a56590054efa76fd64d1
font_01_sfnt_off0001cc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E44A 19780 bytes
SHA-256: 4183158adf255b9086b857cca1b702fde5bb5d8538dfe7439c2fb96feeb6ee12

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