Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f31748695d24b39…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 18:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd1bd6e209331bcdab2d29b9876a5211 SHA-1: 8458cb38a6208503c190834c164555ab24a641f0 SHA-256: 2f31748695d24b39cfa2b11ed3b7d9e7c0840cd3fffb77b5864cbd7dfca68129
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a high number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure of downloading a payload. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=rapid+cash+apk+download PDF link annotation
    • http://vipacademy.org/userfiles/file/xowopixuj.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/78458550970.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/zawasapamofomakamewuzo.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/81198935504.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/xatofobi.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210905_CD86A3BC16CFF763.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130331b31580---1306042633.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/faxod.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/45032664819.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/mejulikijizisopo.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133037be10ae---8316947284.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/49398072267.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/2272128638.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/faxazarebilozome.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dca57081e---5943812317.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/letuwuruto.pdfIn PDF document text
    • https://invest.pl/userfiles/file/91684489041.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/lujoximibelejizutepowosag.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161331d70abdff---luxoxikevuvadosajajalam.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/89288184533.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/wovatudapanitozumaz.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/15446409053.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613417c282cf5---samigogavafu.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/10106479106.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/30942128647.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130a9057b9bc---zabavoze.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/rabopunogukizijomevabif.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_off0000d6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E4 10504 bytes
SHA-256: 06a7d06d4237741416294362a32dcc8f5d78e12e370b85e77bf0d0cbe24dbb5b
font_01_sfnt_off0000eeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 20132 bytes
SHA-256: 262039f78648e297be25426748b07553d4fe587410acb194fb40c04cb45f0eca
font_02_sfnt_off0001232e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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