Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac768cc1694b1dc3…

MALICIOUS

PDF

78.6 KB Created: 2021-09-21 00:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 049132b5414b326acd861ef6cb0de5b9 SHA-1: 0f6b12da347982fac9e6dbba41bb612acf260681 SHA-256: ac768cc1694b1dc3b90ac76b9f9e29be96f59580c12cdb2a17e113618d9f46ad
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and a potential phishing or malicious document. The embedded URLs point to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://debsecond.net/UserFiles/File/10365417527.pdf
    • http://wildpflanzen-planung.de/file/mujupexutil.pdf
    • http://tznjl.com/userfiles/files/pomemuwozoj.pdf
    • http://rbtyutj01.com/userfiles/files/92624948026.pdf
    • http://easyliveconstruction.com/ci/userfiles/files/memunibis.pdf
    • http://topenglish.sk/app/webroot/gallery/files/fewaderugusaxif.pdf
    • http://imssp.by/data/images/fxeditor/file/33640411958.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161390edf3fdbb---viduseb.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c819a3c84---xukolapiwuwuti.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161362ce3dca77---21474465258.pdf
    • http://steinbach.casawell.tw/userfiles/file/28490689513.pdf
    • https://kalitelivideoizle.com/resimler/files/runiviwirolitoka.pdf
    • https://bvphcn.bdata.vn/upload/files/81356084600.pdf
    • http://kavernoklub.com/campannas/file/mivun.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614071a119f4b---84381956961.pdf
    • https://strategie-forex.com/ckfinder/userfiles/files/xetix.pdf
    • http://koppeika.ru/userfiles/file/13232686059.pdf
    • https://seikai.jp/free_images/files/zubuvoboralikekumujokidev.pdf
    • http://stphilomenaonline.org/userfiles/file/torusajisoko.pdf
    • https://volandovia.it/public/fileeditor/file/36874399172.pdf
    • http://briztravel.com/upload/files/jinumusogazeparetumekad.pdf
    • https://inarsindbari.org/uploads/78130422982.pdf
    • http://sangjeom.com/userfiles/file///wunofabiril.pdf
    • https://hiddencliff.kr/FileData/ckfinder/files/20210920_19BEA4FDC5105EFD.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=music+pro+apk+download
    • 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_off0000d27a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD27A 16792 bytes
font_01_sfnt_off0000ea8c.bin
c5ecd1470cb18f81a09719c6e5fb207fec4ff06a7649a3188692d67d982c15c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 16480 bytes
font_02_sfnt_off000114d9.bin
3781a02d40e0a005da3f6805a40e2b7d306c7e5fedc8c9b578ffe0cec03a1f0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x114D9 10548 bytes