Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec11beb294f2886…

MALICIOUS

PDF

91.3 KB Created: 2021-06-28 09:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dc3bf01d4546a1660a780b40e3375e07 SHA-1: 66ceab0040193a39cda739ca24dc9236b9b99457 SHA-256: fec11beb294f2886d19cd5b25989a5f62d9ccfd18d1f30a040763f4c6b8fb2ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the document is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/369c65261a0ce9c481ed401e78569c2e/64285723930.pdf In PDF document text
    • https://inifd.london/uploads/file/15815602952.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bafa4c3338---1179896967.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/31497612514.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/luwiwixov.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/33133344160.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160783390f2c41---46468123050.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/89197476247.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/vesesipumapaxekujokek.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/33214f461d2b335b900475fdb629d66e/14643093726.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/aa91hfci38n1vc1p0tk1965d85/zoxonevupin.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/48357174505.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d25332e545---tigaxujolinup.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a81af90767f---32505513635.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/qur5p6a0io8oinl6ii43lkmee0/29283328142.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/bivuvaxepagox.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/77085593132.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/2ee109367eab9157652559e0ec7e055f/94674266148.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c1f7db451---rorarimefuwogetobakaxa.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d57f04c1eb---mususixoxolimipefigeji.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd01d18a1d7---feboberopifo.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/nejipuduvenimazedada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=a+breach+of+contract+entitles+the+nonbreaching+partyPDF 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_off00010144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10144 17268 bytes
SHA-256: c4b28772ebec35a7a2afda7371c12e24a5868e546704311ec6ec190d0979a857
font_01_sfnt_off00012e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001464a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1464A 10992 bytes
SHA-256: 6905544bf8c76406d5491bead4504000aa2aa0c671b2c891347be4db4f5fbb68

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