Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2944c1ed350173c…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 15:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4be374a23e1d3952e274b8d144229339 SHA-1: e08d35a8c0ee8548038ff11f55695f4f66add7d8 SHA-256: d2944c1ed350173cd3fa0dd854ae6a8c373b5b76154b7f871bcc5719410ef7e2
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including an ML classifier and ClamAV. The 'SE_ADVANCE_FEE_SCAM_LURE' heuristic indicates the document's content is designed to trick users into paying fees for a non-existent prize or parcel. The numerous embedded URLs, many pointing to compromised or disposable hosting, are likely part of a link farm to distribute the malicious document or redirect victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://clickvay.com/upload/files/4007083228.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa33d4873f---54946082768.pdf
    • https://songhongresort.com/img/files/333345366.pdf
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/lubedevugeluxolisi.pdf
    • https://biomedchita.ru/imeg_master/file/tatino.pdf
    • https://ketdoanbus.com/webroot/img/files/87513633375.pdf
    • https://xuantruongtech.com/images/ckeditor/files/71913851000.pdf
    • http://www.w.radeton.cz/ckfinder/userfiles/files/kemalelel.pdf
    • https://datajournonepal.org/files/84161618651.pdf
    • http://majstrissmt.eu/www-data/file/82283018350.pdf
    • https://pmcp-avac.com/files/upload-ckfinder/files/pifelatur.pdf
    • https://nbcmedia.vn/ckfinder/userfiles/files/kivoleb.pdf
    • http://eurekaelearning.com/upload/news/file/lavewuwumuvosuxozakugu.pdf
    • http://siltherm.com/ckfinder/userfiles/files/85817014374.pdf
    • http://kepco-group.com/uploaded_files/userfiles/files/jadasavat.pdf
    • http://kengosushionlineorder.com/uploads/files/velis.pdf
    • http://vilocom.net/webroot/img/files/32410547696.pdf
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/liwiral.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/447732fe8ff3e068d31ead6ceba2684c/leresixifuxakowijerizin.pdf
    • http://music-summer-courses.eu/upload/files/56575721061.pdf
    • http://nakajima-ya.com/upload/save_image/files/33358439186.pdf
    • https://cmflower-kkc.com/ckfinder/userfiles/files/jigugapotokuvefebenojax.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/5qvvk5b4vt9lu0vcn4fcjde29j/73169960675.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/11800765003.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=come+aggiornare+samsung+galaxy+s2
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dee6.bin
f848e9940889baca6491945d07b92336c03cc39ee56845a28d55083ae202bbb0
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 10820 bytes
font_01_sfnt_off0000f7e9.bin
38edd512ec5c909cb156bfec36e2c2ab763de16f8414077c979159b517a2751e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E9 19636 bytes
font_02_sfnt_off00012af6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF6 16792 bytes