Malicious PDF — malware analysis report

Static analysis result for SHA-256 e295dec4ebc343e5…

MALICIOUS

PDF

76.8 KB Created: 2021-09-17 06:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e7e32b5dd6c539f8756a8fbe22225b51 SHA-1: 7676871056508432fe10a6f46fe01262f4696001 SHA-256: e295dec4ebc343e58bafe2ddff3e4175b2d2213e01f4a4be50887cde53b7f171
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://inwebjor.ru/uplcv?utm_term=message+from+android+to+iphone PDF link annotation
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/66713648466.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/32578475221.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/44329219341.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/13977217067.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/gewurifosemu.pdfIn PDF document text
    • http://gaudi.tw/upload/file/wazija.pdfIn PDF document text
    • http://travellerisland.com/files/nopudesaxalejupip.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f8cc1a5a9---3633832059.pdfIn PDF document text
    • https://invision.buzyhub.com/files/zidiwoxukigomuvuxokoma.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e251382f62---21223469660.pdfIn PDF document text
    • http://ombs.ru/uploads/files/54350215168.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/6585743737.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/61512510722.pdfIn PDF document text
    • https://viceda.com/userfiles/file/wewumadojuw.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/0b90a1462d2d970340b3122144d82894/23673061663.pdfIn PDF document text
    • http://byecook.com/ckupload/files/famigasadedavejajiwane.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/97581244436.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/21900226897.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/wafitu.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/tunaxozawe.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/rodadoxajafiroguv.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/98216851160.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/71700035679.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/56544773308.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/kevogaguke.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/99565411275.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_off0000c8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D3 10892 bytes
SHA-256: 569aa224c9660e9dbd6c2ad0e555f67a687c5840a6ae3b124913a05bb80f7fb8
font_01_sfnt_off0000e1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 17320 bytes
SHA-256: d2eb176881eea5390fa6717db5b612f3bfc182c0f8daf723a4e64f0e7d8b6250

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