Malicious PDF — malware analysis report

Static analysis result for SHA-256 2816eda48fa874e6…

MALICIOUS

PDF

67.0 KB Created: 2021-09-04 14:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 229262017ea00c6265efc5e75cef33a4 SHA-1: 8a6beff8c6fc958430e1279d5a73cc3ef0c8ac33 SHA-256: 2816eda48fa874e600e9aad3265521ce9c9283fbbfbaa47b5a26614722b70517
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed as a link farm to distribute malicious payloads or conduct phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4625

Heuristics 5

  • 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
  • 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://laborke.ru/uplcv?utm_term=polyurethane+adhesives+pdf PDF link annotation
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c37202cced5---47498771483.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99f19361b---23870827805.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/vivirobeniruwirefanizuwa.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/99445708122.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/4521496835.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/e9180adb26fad5749dabdaf5c2f8a8ae/tugofimabe.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210823/file/16297018238892.pdfIn PDF document text
    • http://mrsjamesirvine.com/clients/82887/File/webiv.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/vuromopurubuzarikibovib.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/75732301348.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/6a2a22ca9a60c6951822046b6cf61423/sozesalor.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210507103043.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/e37873c3ca93b71bf2e892d9bdd5ad60/19095919032.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607384e7d9efc---16016311239.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/lobefupizolikoweguj.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ace2e8826---musawaziteditab.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85b16884e---31754570600.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/8719632653.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9221b37217---56215690863.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/d05f5362b3b694394c3946d4d33382e3/13776464872.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d59e96f11d---29107825031.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/25296736036.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/wugoxuwiteketus.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/69725004165.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA40 10876 bytes
SHA-256: 1a3b00b656a13e0b773b16ccc37ca36c929d9f7d13001455b6d1e5ea01a4dfcd