Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd47df36e734817a…

MALICIOUS

PDF

89.8 KB Created: 2021-10-09 18:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b6a780858c41411b0cb97ec75a2271c6 SHA-1: 91040c028c9857080fc6cba0f70f77a73c863d2a SHA-256: cd47df36e734817a277d20790e2f42265a3cbcccde0bea6502ef63d34d89fc94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites or disposable domains. The embedded URLs and the overall structure suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=magnetic+effect+of+electric+current+class+10+s+chand+solutions PDF link annotation
    • https://rh-h1tapi-turbo.com/contents/files/56129303390.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/bowikerimekakogasuvid.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/41782982863.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/60821663147.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/fapebemaj.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/34706103863.pdfIn PDF document text
    • https://clubon.top/uploads/files/40759117414.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/xeloxep.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210928_112B6E1261CF71DA.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/zajovibemufokugo.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/wugivoforoverog.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/zutuzewafagajan.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/zetofopewapedosoraj.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/padijaxufiburolumawakiwe.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/22876347321.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/wipegusafopexitodezugot.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/modotudokevukobopof.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/77891937523.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1615f4fbae7f13---34715261808.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1616178abd250f---fapezuvajikakowularijixu.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/telamerijejutemu.pdfIn PDF document text
    • https://endobible.com/userfiles/file/78292434314.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161575975dcc2b---takuwerelet.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_off0000f3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C3 11024 bytes
SHA-256: c8441d99926df909f93397f12b79d6d4f98c19eab0fcd0f4f28440690c95e017
font_01_sfnt_off00010d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2F 20216 bytes
SHA-256: a9e472fc95ed4433d02c58a52d2b5d27a896433a8d6c2a43e87d9958e30eb0b7
font_02_sfnt_off0001411d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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