Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8daa4f6c3d56d28…

MALICIOUS

PDF

81.9 KB Created: 2021-09-10 17:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: db7c4db0eb72f4095bd5177f1cd636b4 SHA-1: abcfa90fac8988760641962b9dc7e04f78fe4203 SHA-256: d8daa4f6c3d56d28266825c5224560d7fb92ebd97e8d0fdb3290c48963df1d43
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://allytemp.ru/uplcv?utm_term=american+horror+story+season+10+streaming PDF link annotation
    • http://an-professional.ru/img/files/file/xafovuli.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/19800471225.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f4c2dc0a0---gugisijit.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/82344321646.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/raxuvafanoku.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/95112305819.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/46467601789.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/fb4ef786ba111d3ac662528eceb19365/vurafimemoboworerekibaze.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/gagaziwoxakijusa.pdfIn PDF document text
    • https://esz.jp/img/editor/files/simetidobijewekoterilef.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/mepugekuzetovasajipakaga.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dhvn5bsm7nj8dc8csve4ca5tn5/65633857032.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead4b593b6---31004223180.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/kivubipiwiwewewetavebimo.pdfIn PDF document text
    • http://atya.eu/files/file/81429259262.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/belususuriwitusawitipad.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/53871879495.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/611c36659e846a516c7e6e1c1441fa26/25448153490.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/79630871814.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/bolozulutuferipilagomox.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/33813567794.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_off0000d8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C1 10900 bytes
SHA-256: a3c4abff1bd810a1253b176e7c033ad66e7b4f26ec91d0452150f2cdf2360c1b
font_01_sfnt_off0000f1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E3 18764 bytes
SHA-256: 74e0ee0761ae8bae5043c4eea542c4703fac0bea92b09224d02472b44cd5da25
font_02_sfnt_off00012257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1