Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c147bd24123341…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 06:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e603c1e485ccba4420d3e7051932b3d SHA-1: 65b64f0c7a9a90f6973b1bca49d18311c27516ad SHA-256: 15c147bd24123341e6b02cb7c95b23d4d1e6893d01578eec3c9a721d338093ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics point to the document being a link farm, with many URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the presence of external URIs and the overall detection suggest an attempt to lure users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://ostrichpharmaceuticals.com/userfiles/file/dapevojedopazepom.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/dt93i3qpi2rbip3o4lmg292b7h/xemodurejugexadokurureza.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/xovuvafiremuzefusun.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/15968214516.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/fisedazemib.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e4bbb511bcb---64378877511.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/dewir.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/panujibelidimone.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/boxabiwosokerop.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/99882518186.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/a9802a3c77b61c24c0022c95aec63d63/12507662305.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/22382681702.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/wiwobimeveza.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160823f0fdd480---renufubabuxezedokofudut.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160f34064925f5---14952043127.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce0aa38661---wedigurufefobidiradepalap.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/59611674547.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d69c4208---4322147242.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/xurajidexijorutekoga.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/posewizafa.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/92e11d1313279d6cd1590e8c9e481e82/fenedipegi.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/pavedagi.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/48845804186.pdfIn PDF document text
    • https://majubesar.info/contents//files/detemezel.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/9b8cc9dc43aa2a580982d996fb28ead4/lufazuw.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/9a350da07de951a4b6be08e3915a2164/kijixaveveriraxebiko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=windows+11+iso+download+32+bit+and+64+bitPDF 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_off0000e828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001003f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003F 10820 bytes
SHA-256: e6e0d219f09042d0754c76a0b6c92ad1bc0ac2f780f8f7747fadb3d10e29b8ad
font_02_sfnt_off0001197d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197D 17436 bytes
SHA-256: 2d3860a29b47596b307de7420cc901c29ae175e8e60950d5c56f9c54ad8cc915

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