Malicious PDF — malware analysis report

Static analysis result for SHA-256 9550f852eca29961…

MALICIOUS

PDF

79.1 KB Created: 2021-09-13 01:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 913f1d735660ee028c7ef91983784aac SHA-1: a9c7fc7d3e9f5f7c09c7f8d48acb00d4aeab0f52 SHA-256: 9550f852eca299618e654a647e9aabbe6851b0b503321e62a80c88d0eaa35293
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs, such as 'https://pistant.ru/uplcv?utm_term=1080p+video+downloader+apk', likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pistant.ru/uplcv?utm_term=1080p+video+downloader+apk PDF link annotation
    • http://evaemlak.com/userfiles/file///35627102045.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/bizofoladegaxunibuz.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/55512515080.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/fufazejelajunasewuz.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/18551257101.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/70966131533.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/bivetitiradavere.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613960a69848f---razepov.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/sotumavefomizef.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/muwapij.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138012e8afc2---rewaxutixerepuxamil.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/33084431312.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/mosataliresamugoj.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/lasufime.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/38525940861.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/1673037887.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/tazodukigibamirexal.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bf1033910---sajedefab.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/ketemoratasapivixa.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/18416428554.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/mazevi.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631387203.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613746179542f---vebuwuxarowonulugubil.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/sikarijoxisuvoritebuda.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/wozore.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/47654051303.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_off0000cf75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF75 17988 bytes
SHA-256: 3b60fbaf882b2ab35887e1d00fb47ce62fd2b9b046c199cb6d3d3498908230c3
font_01_sfnt_off0000fe54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001166b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166B 10648 bytes
SHA-256: b2f80a2292132833fb28478f7cc471200df359cdfd13d391ba37466f85a9c856

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