Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90cc1415fffd33f…

MALICIOUS

PDF

70.6 KB Created: 2021-09-08 13:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 1263867e5227827a2924f364de56d4e6 SHA-1: 5a0121ba1849a9a8518174393e197e0fbd39957e SHA-256: c90cc1415fffd33f3575ac0b679c2fbe428dd6a35262218bf3b7755473501bf8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://pixomot.ru/uplcv?utm_term=types+of+grapes+for+wine+pdf PDF link annotation
    • https://sunnyvale.com/wysiwygfiles/file/58154122603.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/5915848607.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/gojugelikod.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/wadiwumesupinexet.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/24010677130.pdfIn PDF document text
    • http://hangquangauto.com/files/bodaxivedokadonobo.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/77406609231.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/56646501704.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210904144755.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/15567940718.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/vasudonejibofufazijide.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/61541827326.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137756077941---35399620154.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/1364591016.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131b945514ff---rudunutig.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/vurazugenibagotu.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137a2529c0c4---gokotaxalixoxorarir.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/ginekunuzorun.pdfIn PDF document text
    • http://df-2.de/images/daten/file/19348199186.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/qv105f1uggenl9upff1qeasfs3/niruzisemufivaxidomak.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/1315415892.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/10248880915.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/bodanolidiv.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/juvosaweg.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/ferazo.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/zofivofibixukojo.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_off0000b331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB43 16032 bytes
SHA-256: 46ca12873b0e92d6877359d282a0c2721a2fc05e4f06831f67fa166a1a81d6f1
font_02_sfnt_off0000f435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 10692 bytes
SHA-256: 42ceb8ef7b1f68b50b26f2220d4dce7838ccafc9a6a942619afbb960533a4f99

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