Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15e399b2f34e92b…

MALICIOUS

PDF

84.4 KB Created: 2021-09-13 06:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a240115c0b6cd2e010c1e4804a19564a SHA-1: fd2aa620ff5aa22b725568d6165aaa4ad9abf27f SHA-256: d15e399b2f34e92b934e74c2331709919212cf7abae6e91163191be049871588
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://irlanc.ru/uplcv?utm_term=messenger+lagging+android
    • http://eksternest.be/images/file/21761825761.pdf
    • https://10fci.org/userfiles/file/52662305818.pdf
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/jutokasupemi.pdf
    • http://www.siposferenc.hu/html/47820909692.pdf
    • http://pbhdom.eu/userfiles/file/9596357889.pdf
    • https://rajatotogroup2.com/contents/files/87817431402.pdf
    • http://www.luna1956.com/images/library/File/tudalof.pdf
    • http://distant-property.ru/fck_editor_files/files/74804120204.pdf
    • http://abbeloosschinkels.be/userfiles/file/54842254969.pdf
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/1470122217.pdf
    • http://china-engine.net/ckfinder/userfiles/files/duvidimomofoxazi.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d16dab2fdb---96895307628.pdf
    • http://carrozzeriardue.it/userfiles/files/31976828165.pdf
    • https://vrindaindia.com/php/joseph/uploads/file/fumokikelofepexa.pdf
    • http://ministryofrum.com/memlogos/file/zugusaxutim.pdf
    • http://benevolo.it/userfiles/files/91675069425.pdf
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/wejebovezuwojexasubosak.pdf
    • http://meubelenindex.nl/images/uploads/guxubanipugusipadis.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139f8ee4ff3c---43890594884.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/78975685410.pdf
    • https://xrtradingfeedback.com/cmsimages/file/29908313712.pdf
    • http://wabasnb.com/files/fckeditor/file/183507866161325260ae1eb.pdf
    • http://rm-centr.ru/uploads/file/62019724958.pdf
    • http://www.premiumimport.nl/ckfinder/userfiles/files/nibozaxed.pdf
    • http://kaitosushisb.com/uploads/files/tegalixan.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f05dc3515a---naxiwi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e502.bin
69d5ab9839a65dca0ff67b0537429ee5a6312d4b5182474aa3ba677a1bcd201a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE502 10316 bytes
font_01_sfnt_off0000fc1c.bin
d47056cce27924d865317dc5c4a097e536bc8ce2862d40b0f3631249d315fa64
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 18092 bytes
font_02_sfnt_off00012bb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB9 16792 bytes