Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55a082d6662434c…

MALICIOUS

PDF

73.1 KB Created: 2021-09-15 14:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfe5da99605c3c56a6cf8f8839fa57e8 SHA-1: ebe16bca841b98746fac7f31eab94a000b248dc9 SHA-256: c55a082d6662434c3e71e137cd1a38a87886d9268cc196cd662900de4c00cda2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The presence of a 'link farm' heuristic and the ML classifier's high confidence score indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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
  • 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://irlanc.ru/uplcv?utm_term=download+jetaudio+pro
    • http://www.impactit.in/ckfinder/userfiles/files/12435330978.pdf
    • http://summitremodelinginc.com/userfiles/files/xujalowaxor.pdf
    • https://mimpishio2.net/contents/files/46675846624.pdf
    • http://mishor-uvk.com/uploads/files/fidomufukobunukun.pdf
    • http://gonganmi.com/userfiles/file/29222821138.pdf
    • https://asmitahrgroup.com/ckfinder/userfiles/files/lilikolipuropinuxegune.pdf
    • http://allasclub.com/campannas/file/remonopasuronefuwego.pdf
    • http://olgapolyakova.de/files/files/52666972385.pdf
    • http://oldadmin.k12cart.com/media/files/51887310154.pdf
    • http://musicfriend.vn/public/default/ckeditor/files/4673392721.pdf
    • http://orderkiwicafe.com/uploads/files/kefotexija.pdf
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/bipezogunokotiwedolito.pdf
    • http://hattingtoemrerogsnedker.dk/userfiles/file/64334321929.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/d7513b5b5e28aa1d878ca3fbf66fbb1b/wakememoruwarel.pdf
    • http://sashtraayurveda.com/ckfinder/userfiles/files/lepoxefibojuviroju.pdf
    • http://dga.gr/ILC/img/file/39102581332.pdf
    • http://meskerjager.nl/media/files/kuzubopagagemibabidobuga.pdf
    • http://kaies.net/upfiles/210913055423934015m8bhr3.pdf
    • http://togul.org/sites/default/files/file/ximadudopokupapofoder.pdf
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/zimelo.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/2099684bb490fa9e118551312f518086/texoz.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d059115940---terolakobawuvabajeko.pdf
    • https://bawwabatrizq.com/userfiles/file/98863621867.pdf
    • https://www.igescanada.com/ckfinder/userfiles/files/xexalutaboxu.pdf
    • 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_off0000bbde.bin
b7c11c3b4aec5e7a44abdaf99c6f52844d3527a4811663cdcee927d2306fe682
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDE 10536 bytes
font_01_sfnt_off0000d3f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F2 16792 bytes
font_02_sfnt_off0000ec04.bin
4af5863e19a516b7955f3660b00755f2454c440b545c298ac13cb8aea64e559a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 16612 bytes