Malicious PDF — malware analysis report

Static analysis result for SHA-256 29804c562e18d14c…

MALICIOUS

PDF

82.6 KB Created: 2021-10-11 08:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 71170e76b8425eee77174e016a522b28 SHA-1: aa31545f32eaf7d6ac98fe8d14c96784c0b0927a SHA-256: 29804c562e18d14c6e1a67fc80bf3493f3205dcd93b8e94f424e63834879741e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://svadbavmoskve.com/content/xuploadimages/file/bajejesijumamofu.pdf In PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615662f194218---kogejifitirek.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/92207022006.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/40142867889.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/tixomesuwobavalanuxin.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161635f9a9984a---17744100326.pdfIn PDF document text
    • http://dolaninsurancetx.com/customcms/uploads/files/nuwexuj.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16162683c1b632---kibizodalamuwanore.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161452b81cc9c0---38801551680.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/6257512254.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/69437749234.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/gapivikisawimexob.pdfIn PDF document text
    • http://bjjiffy.com/upload/90817299195.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/pogulelixatunatobode.pdfIn PDF document text
    • https://trexanh.net/upload/files/xazarug.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/3527830028.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/fejexevapoz.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/96886115951.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/48096073017.pdfIn PDF document text
    • http://premo.at/userfiles/file/soduxenituz.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/dofitudazasok.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/76567404596.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/37719942454.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/lurigesavetaselirutebuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=service+manual+hp+notebookPDF 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_off0000d9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 10944 bytes
SHA-256: 9406d6c500c3d30a302fa4244a7e1c4693d1eb918c31bd6e0755066f74d30f37
font_01_sfnt_off0000f2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 19408 bytes
SHA-256: 3c30247a17bc7a5e19ce87be173da320b5c9ce720d819f24ed4ac46040d11add
font_02_sfnt_off0001251b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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