Malicious PDF — malware analysis report

Static analysis result for SHA-256 da67295cf7e99574…

MALICIOUS

PDF

97.6 KB Created: 2021-09-01 09:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3d6a683257635280d3c204df817e4ddc SHA-1: 5050a112afda61eaf80b1a47b752dc84c9150525 SHA-256: da67295cf7e995743bb23637d58ede2dade3c26c989f8591de1d293f976dc22c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed as a link farm to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=i+want+to+write+a+song+lyrics PDF link annotation
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1c02928826d4c71cb52fec45b050a5d2/46753587896.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/247856e5d059d838655dc90a26b80c8d/45806272709.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/zizawufepurusavak.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/87076342860ff8fa645d3e.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/61460010596.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3db1b5df7---37996072974.pdfIn PDF document text
    • https://mgc.to/sites//web/upload/files/30657065448.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/xokiwepuduje.pdfIn PDF document text
    • https://petikdaun.com/contents//files/toxedolalamipo.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/jafupiba.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/lusal.pdfIn PDF document text
    • https://ebooksweb.net/files/file/dulatuvodogonirinipo.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/23947748061.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/fidurixonivused.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a60f09b5cf2---xinofalexuwatamopol.pdfIn PDF document text
    • http://otczenacts.com/media/files/junaga.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b55bc008e4f---75807164960.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/polikeb.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/dizifokuzodax.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/55326755990.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86d5d1faac---bovomugibobamin.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca973c05d7---38974162642.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/scrvf2q1bf2fk41p4isltjbu52/79223810103.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/40301712882.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_off000118ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EC 10556 bytes
SHA-256: 08e0df44301a1e27a0dea64f5f8b420adbc8c8e72f00cdbb9bb51055175a89a6
font_01_sfnt_off00013137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13137 18380 bytes
SHA-256: 91c5c27c79095814e39fbdcb84a6efa4f23e75b683d1db202a2258f1a10d9b84
font_02_sfnt_off000160f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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