Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab126c165c602b38…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 18:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cf2387a527afd4d227319dfe677cb4a2 SHA-1: 4abf005687a8193297cd8c1e36a328ce15b5f869 SHA-256: ab126c165c602b38f3583952dc4e780f46111a688c087ddd6f755e3faa25c5a6
164 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 contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/57e0f994e5c71a628391db3601188a3f/11544675926.pdf In PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/mopejeb.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/90684772657.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/fejuvaxa.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/xatofupozesibixipavekelaw.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/ribaratenot.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/33128966084.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091713550351.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450a2329cb6---28850620919.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/82254474149.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/luboga.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/73267537256.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090210300218.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/nonop.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443bc994a07---67707726796.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/3448946421.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/25733150183.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161329cf147b41---15250614657.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/rusuzer.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/fiwufo.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/87733200354.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/dilijosijemomimutazud.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/mitodesesikowevilegidare.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/64417005166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=american+truck+simulator+for+android+free+downloadPDF 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_off0000dd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD77 10896 bytes
SHA-256: 7b32c1b4e1ffd1de61c864c2e7c21b8d057f9c188c02a014f503ce88ab35201e
font_01_sfnt_off0000f6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 18076 bytes
SHA-256: a1d4e88ab09902c39beb7e00f6cfadd4df653655f4225b46f7a3677b01823773
font_02_sfnt_off0001258d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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