Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d2093db5b5f0a1…

MALICIOUS

PDF

83.5 KB Created: 2021-07-10 06:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10cf04b5b7d6795dd52a9a8c881c8be5 SHA-1: 282c108ddb853163debca35072ca580119a232b5 SHA-256: 87d2093db5b5f0a18e27155310d1e882878fd8813b3066812785951c0288b956
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are consistent with a malicious PDF designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nguyenthaotech.com/upload/files/xivesubajupujasusoxur.pdf
    • http://alphasigmaoverseas.com/userfiles/file/voputuwusap.pdf
    • https://medius.sk/userfiles/file/15346627022.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f6a84928---17862169629.pdf
    • http://lubrifianti-auto.ro/files/file/96685598862.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f585e5aa687ac630074c144ae455292c/21592304280.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fefc3b4391---45726638721.pdf
    • http://al-bandak.com/userfiles/file/83972990018.pdf
    • http://roocenter.ru/upload/file/67868326985.pdf
    • https://rugsinc.in/UserFiles/files/51432467360.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a84f7ab152---57280777623.pdf
    • https://rozgarnetwork.com/ckfinder/userfiles/files/40910769197.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d032acd2720---bapurelolewelonof.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160757ba8ea524---somejopijamatobojedefejos.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941db051eda---74911915557.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/n895p39o8rso1jg7co8ot92vpk/21301202292.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b01902b2583---betuzosibipopilezulite.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dea48d68e6e---xukuvulojun.pdf
    • https://sentinels.ro/userfiles/file/gigopaso.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=kindness+things+to+do
    • 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_off0000e46a.bin
a93e63999f9d805cb339d0ede4cd125bd18391d1e72b5383e9b7437aa0911544
pdf-font-stream PDF embedded font (sfnt) at offset 0xE46A 17648 bytes
font_01_sfnt_off00011291.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11291 16792 bytes
font_02_sfnt_off00012aa8.bin
9dd16d09038fa7ad7dbb6ec23f96ef64308bf60659d2c4226b16db96869fa30d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA8 10212 bytes