Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d198e64f51bbc2…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 08:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f1b1eb70efad522226627be347a25298 SHA-1: ad397a471593b6ed4788a2b48b1dde287216a9b9 SHA-256: 64d198e64f51bbc271d448999c04df6236f1b19acaf596e8b7618c17dbbd12b7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to potentially compromised websites or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded links align with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://huntic.ru/uplcv?utm_term=hambley+electrical+engineering+solutions PDF link annotation
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/xevewojutavevuvigek.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/45010571183.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/vinep.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/meforefo.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/65508294131.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/palopemevomomudaxanapid.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/nosikesorurub.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/32982539449.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/dugamum.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16144e799c765e---vilunuzamezukidoxud.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/12/file/20210912_011724_181.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/57451568861.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/64325638036.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/73166685228.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/xirebivugepanuwavulov.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/xefojataro.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/makunuwusipagafuxawax.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/30743875024.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/50789295678.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/cf8814a21f82fb8b4b79f0d25d06367f/sakel.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ra9qbj4jgd483up3v3qbgsuu41/37581988852.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109100853573123.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/46589108524.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/lonesaduromami.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_off0000d274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 17264 bytes
SHA-256: 3191b106d09bac65087c56e470e95711f6ce34cc39d900b609701c337f2780e0
font_02_sfnt_off00011762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11762 10920 bytes
SHA-256: b2a0485db57bc3cd175c621140629f48e88b601152fd8873f30919e4f9b08df6

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