Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0a5d58655cbded…

MALICIOUS

PDF

96.1 KB Created: 2021-07-18 16:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2ce69a74c53ee568ab8bdb1baecb70db SHA-1: 1a01e73eae968e8fdf687060062c64596a39fb0a SHA-256: 8d0a5d58655cbdedb182219be5bfb98dd1afb67a19bec69677140ac8337d928c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942c5c1561e---70799819430.pdf In PDF document text
    • http://capital96.com/userfiles/file/kexep.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/rabiwiratepotinix.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/julilexamedi.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/85961759301.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/zupizeje.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607797d8144d3---7827121196.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/52024665966.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/77155023278.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/24htb30n1u4maov9949rcd8501/donabedu.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/55630284409.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ijdp6pjsork0opllqbp7updp73/xoluduga.pdfIn PDF document text
    • http://househouse.it/userfiles/files/91589010644.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/28545566683.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06f4900be7---rojufososawibogadunego.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/58371ho24a8aqa9odj7kpgcigu/62714109062.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/37526815854.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/np6qbd494u6vo7manvqt8kj605/fiwenozasagumezekokabate.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c394f63599---4478192238.pdfIn PDF document text
    • http://securitydm.com/slicice/file/bifofepewosikivina.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072b0709deae---38973999584.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e085dd1b8ba75670784872d198c2320c/96875089778.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/zukedoloxigifepezuw.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/118269640.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a21c0f52d89---72048893686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=biological+compounds+worksheet+answersPDF 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_off0001146c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146C 11292 bytes
SHA-256: e563e04b9d71c5951a682c53d3441270c7630754db0e253e7a817c419dfb9324
font_01_sfnt_off00012ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA6 17256 bytes
SHA-256: 3407555746210ce83b47ca599190d33d792679c5d808727bf7f17f7a3e50a25e
font_02_sfnt_off00015a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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