Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5814a309688fe67…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 23:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 42973ce61b319fba696de5670f437c57 SHA-1: 9d237ac4eab2fbaa538eafd1bce10f1f941258fd SHA-256: d5814a309688fe677f95cd8b49d81f473f8f39699d1b2e5f1971108e68de394a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to create a link farm, potentially for SEO manipulation or to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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=the+essential+dykes+to+watch+out+for+pdf PDF link annotation
    • http://homeopathyhongkong.org/files/64472668128.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/61853096075.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f51bf8cc902---32697793119.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/7d0c632fa29b60087a4e8302bd6e73b1/mavevodabolumizogadobex.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f04a7617a---85578595880.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/88756461742.pdfIn PDF document text
    • http://xn----8sbosgn1al9i.xn--p1ai/ckfinder/userfiles/files/liromelipopoxaj.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/81057176217.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/20954573863.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/nisetuzidume.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/78091631715.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/1a68a7e6592c0aa04e2a329d3ee2fa39/29516442429.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/4059660690.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/071fdf4ec211c5c868cebe0dbd5a1db4/mobagajoxutel.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/689dd11805c931dd444afc47081fd7d4/98622300212.pdfIn PDF document text
    • http://93564497.com/userfiles/30060435305.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/m066sc6g4v2iqdrmq7he3h7ls0/disur.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/84887544332.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/benadofufon.pdfIn PDF document text
    • http://clase86marista.com/clients/25276/File/34336916880.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/kamanitibap.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a160ba8f---tipewowuzepekulukaxamonoz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094591a58e5c---61380703297.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/bavetigunab.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_off0000db19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB19 17852 bytes
SHA-256: 6c8c4412d27cced2da7fc0039c33a801b2cec8f884b53e119f7fc4139b1c8314
font_01_sfnt_off00010907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10907 11072 bytes
SHA-256: bf2bbb11627cba77ddc5265ba45fe3981042d6fd15c38bbf8cf0c99f37c6f360
font_02_sfnt_off000122d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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