Malicious PDF — malware analysis report

Static analysis result for SHA-256 4656e4625427f52a…

MALICIOUS

PDF

72.2 KB Created: 2021-09-11 04:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75fe29e9980ddb77f1486060bbbf4950 SHA-1: e0296de21518f1e02a602e8bd809d8ca9d76a6b4 SHA-256: 4656e4625427f52a6197081fbbe91b5ca3cb392e0c11d0c0c69768064f4a417a
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, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports the idea that this document is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://huntic.ru/uplcv?utm_term=star+wars+angry+birds+apk
    • https://thucphamtruongxanh.com/Upload/files/zisev.pdf
    • http://yushendesign.com/images_fck/file/1630528532.pdf
    • https://aventura-agence.lu/userfiles/files/xowupanokukij.pdf
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/zivikopepinosine.pdf
    • https://xetnghiemadndanang.com/upload/userfiles/files/robokagemotifewimugeb.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613be170b225c---guregebik.pdf
    • http://maility.pl/_ADRESuserfiles/file/sopigeru.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134796fae77c---20064091298.pdf
    • http://sportingfoundation.com/uploads/file/22963449844.pdf
    • http://moscow-vernisage.com/files/files/95491596972.pdf
    • https://kokomanis.com/contents/files/13231444031.pdf
    • http://taemyung.com/data/upload/file/34148216087.pdf
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/42614278664.pdf
    • http://kangshi-you.com/uploads/files/202109100612408130.pdf
    • http://bacsionline.net/userfiles/file/tebawibiberivupen.pdf
    • http://cke.hk/userfiles/riwemubomejo.pdf
    • https://mashura.co/userfiles/files/52404637823.pdf
    • http://df-2.de/images/daten/file/47776276914.pdf
    • http://metrocars.london/survey/userfiles/files/27079261881.pdf
    • http://myphammonly.com/luutru/files/rupebalawabidokos.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f2a23b443---pakumijavojusopek.pdf
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/35637149286.pdf
    • http://homeopathyhongkong.cn/files/75894880005.pdf
    • http://dintainoodle.com/uploads/files/nofid.pdf
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/fomajojetegodenamumawiti.pdf
    • https://xnkvinatimex.com/uploads/files/jovivi.pdf
    • https://vinadesigndanang.vn/uploads/image/files/11062431369.pdf
    • https://tahitotfalu.hu/ckfinder/userfiles/files/gezawometotexobutevuxo.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_off0000b6bf.bin
a2f3bbceec971723d54b7ee472cdfee158e96ce50d24240ec31ac7badf7d713f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BF 16824 bytes
font_01_sfnt_off0000e26f.bin
04278e390fe3e51e38181f19171d937ee8b00cbe192885c4390caf21984d3933
pdf-font-stream PDF embedded font (sfnt) at offset 0xE26F 10776 bytes
font_02_sfnt_off0000fafd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 16792 bytes