Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c90313afc28d72…

MALICIOUS

PDF

120.6 KB Created: 2021-09-07 02:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e81994b976cd9f2eb1a9192f5ba1997e SHA-1: 1b2b8f034a84b68efde2b2d199864fbd4402da51 SHA-256: a3c90313afc28d72eaf6d2a0a65f8a1d4c9a106a5b32c26cadb25683760788cf
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on domains identified as disposable or potentially compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on such domains suggests an attempt to obscure the final destination or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://berbun.com/user_img/file/87855935945.pdf In PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/fupadoj.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/93936114988.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/belekukagikenok.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be279493249---wemefadexopoji.pdfIn PDF document text
    • https://plasy.com/uploads/file/vidasekinunu.pdfIn PDF document text
    • http://dgjst.com/upfile/file/semepezilozukere.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/61345f1f06d1d430319c034552619ead/38268914807.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/82393810120.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/9302defdf27c555700ed51ce0038b802/88297141817.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bca0b8d5b3b---59452015238.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/dalulorakonedodiw.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6376460361.pdfIn PDF document text
    • http://markone-tools.com/upload/files/56322614676.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/25742151952.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-16/20210716041446743664.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/xajubi.pdfIn PDF document text
    • https://birudongker.com/contents//files/8028481405.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/disetulovonuz.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9abaf0525---zakudepujap.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/sugojalanakapazab.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/vixefirafofonuje.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/vezunafofiges.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/68399452628.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/xisazeren.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lupubina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=road+less+traveled+pdfPDF 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_off00017108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17108 10408 bytes
SHA-256: 0f3655267de3d8bdbd250422d605e87522ff7aeb41a977272fa38368b3869aa1
font_01_sfnt_off000188c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188C9 19956 bytes
SHA-256: 07a8ddac6d7a9d56073ba5d13a95fb27d7405bac64d475dedbd8455cbd9fad07
font_02_sfnt_off0001bc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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