Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40a80098a7c5eb8…

MALICIOUS

PDF

90.8 KB Created: 2021-09-11 11:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ffb1652ed5bacf9aa2b7cfab1324ec83 SHA-1: 454fb6e39ac16c5e44a4d52e02074c88ff46b49b SHA-256: b40a80098a7c5eb85f9cc821dd571ffd7d36cd25fae6b6b4d5122b1e2d64bb7e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous PDF files hosted on disposable domains and compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://linker.tw/files/34471634724.pdf In PDF document text
    • http://jcon-aps.dk/userfiles/file/fitadubakawugidanagov.pdfIn PDF document text
    • http://xsteelstock.com/d/files/61962659127.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/vugojogipavinaf.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/nunewepojugetome.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/xekojejiluxufanuxunowo.pdfIn PDF document text
    • http://grimastone.ru/files/xulexuvonusadivim.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/rurufukodi.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/rutekivafatelepawejuk.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c3b48ab9d---48289084974.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/14600574478.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/84726017029.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/18328291935.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109102336507496.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630708675/files/vowimevevoburidif.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334730af54c---56155124652.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/lurexejegujisugusawenuzob.pdfIn PDF document text
    • http://htwy.com/upload/file/dajopesefakixak.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/40357351118.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/gusoremigabalisit.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/38785197912.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161349dfc625b4---16096184938.pdfIn PDF document text
    • http://meta-min.com/files/90532085485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+to+write+on+body+of+email+when+sending+resumePDF 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_off0000f7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEB 19080 bytes
SHA-256: 18ea349c54dc8904672a6494f9338fa14a07720476f3e79245755f085c2c3ad3
font_02_sfnt_off00014138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14138 11232 bytes
SHA-256: 11679ba7f028c9b945a678015b199a20eb3f253da5c31501b7ce727d07cc2028

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