Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca86a577fa5be54…

MALICIOUS

PDF

75.7 KB Created: 2021-09-03 21:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8e1247266eb08fd0a85716146c873f74 SHA-1: 3016264847353d9ec9f8b682012a794d264e7960 SHA-256: dca86a577fa5be54e763014927fe9e72c4102c29636690f21ceec10b354e52bb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://datong-travel.tw/upload/ckeditor/files/20210707032302.pdf In PDF document text
    • http://sinice-rasy.cz/files/file/97601957697.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ba0bd4ef2---53217478493.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/93043974706.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/wutanud.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/rimovaxuvazifusaputa.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16119badb17225---86412344498.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/48868529369.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/9vv82mmpkbjt5q6ui64gjaao3o/tasinubifodopanudig.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/a16d6cdefdfe194819eea9cc42ee745c/27496695893.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/4116603212.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/fopuf98n07rjebiri32urcomca/93103522782.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/vupajirazajunolawogumebov.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/goturoliz.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160aa303f78e95---lakibimegudovewojux.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/o047ms06i2uct2b11k81m4mett/67241629147.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/78896697468.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/b399d67e728da558087bc569b6ad4994/zezapebuxotidilebazolax.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b8974fa6f2a---78492268241.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/25034205018.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/ratekerolumovelon.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/jexupoxidawubojulawuvivo.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84760e2f9b---98982697589.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4q912u24fm8o63n1ggomudigmu/jonuxilozutuli.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/vudovagujemupokupasake.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094bc352d37f---tipuvatadebomiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=fire+alarm+training+manualPDF 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_off0000c737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC737 16612 bytes
SHA-256: af1b05bde59c8754fc0f0ee70f75187ba8071941b47c58fbbf36097a1586c373
font_01_sfnt_off0000f1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F1 10240 bytes
SHA-256: ac678892ec982df06f50cc090345c8bb38767395d531fbd659cef305c4d885d3

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