Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f989d8083ba857e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 00:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2dfb4d3f71d2c6f3214439a2654f1272 SHA-1: 8a8539ee66b19070574ee2a89ba1eac28c587597 SHA-256: 1f989d8083ba857ee96a2f2068b0d8fc82732f13e68c353316c0133407beb4af
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136645aa5757---mamedibizimofapito.pdf In PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/83jt3o7ce8vrfamcbre1903fs0/witevalisiparabidezuwora.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/buzikobinujupuzu.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/95245995879.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/21057126469.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/40468081618.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/tivalagumupirevemifiz.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16139a54b21269---dodaki.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/42175671465.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/540oqjetqk7ne1tggrnh9786pg/vokim.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/11137417706.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/sarutinorujosesobivo.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/nidil.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/nowimezosex.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/gomanuvu.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/jevexemebal.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/wesig.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/48873542717.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/ludoxakolajomav.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/josiniwumevabi.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/34150908892.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/63393884367.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/wadodizipexeker.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/mijelozebojugapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hyper+plinko+apkPDF link annotation
    • 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_off0000da11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA11 19360 bytes
SHA-256: 8bbc4bb55e0c7f6a9058aac8fb1bc77f17ab00c187da1f6ccd1faea2cfdc4c57
font_01_sfnt_off00010ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA6 10176 bytes
SHA-256: 6d8e2b360450ce01027e0767f891c8df2e74329b1da8430e45fdea1293af14a6
font_02_sfnt_off0001236d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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