Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b817e4d68e36d5e…

MALICIOUS

PDF

90.6 KB Created: 2021-07-03 22:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b9a99ec3db61f75410650de9f7a783b SHA-1: 4968320382ee26175379ecf3f476d1fb049273eb SHA-256: 9b817e4d68e36d5ed05ede6b9b53ebcd40d3b17c6a8f1063c6e5e291d1bac576
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://oniceh.ru/uplcv?utm_term=how+to+find+the+slope+intercept+form+of+an+equation
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d54dfd7cf7c---30511450300.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6580e66a3---jonutiwiwemo.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/40bba5d2594308e03088f6523fda7804/34341815374.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723941243e1---65422447303.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/26e0ef50ae1510a1abbf838d27c4cd21/8795587141.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075387a8981e---pipunadolimuxajijamoxowir.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/5f71810c13747e7eedd7fc8d8d6297ea/75043652472.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f30445e5cc---23384968402.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/f126a577b5a6469f901a606bf8343596/zotegumir.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7999fecdcf---bujikabiwub.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dad0c8b1143---vevot.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae94b5878da---92944729033.pdf
    • http://yossy.biz/userfiles/file/19995934243.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb1165b4b6---75825648636.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b661b50d047---diwufadaza.pdf
    • http://monkey-do.net/userfiles/file/gelilitefafonajopur.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/1117cf4d7d60e5d65f8e7e2109d49945/rimaxugifewola.pdf
    • http://51-lq.com/userfiles/file///90534853819.pdf
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/sokanexuxilomuxomegaloxog.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-6-16/20210616123111810974.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846a0e8ce1b---dulurobuvavaludezumi.pdf
    • http://ngor2-3.com/file_media/file_image/file/nejalokajitade.pdf
    • http://schokobrunnen.com/idata/79610777704.pdf
    • http://edanieltour.com/FileData/ckfinder/files/20210531_800264E1CF7D3845.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6e5eb7ef7---kosid.pdf
    • 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_off0000f732.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 16792 bytes
font_01_sfnt_off00010f44.bin
2083c0289b609b85a83db3d15d2c984b283ea3c20f75d59b71a5f1c94d8fbbc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F44 19816 bytes
font_02_sfnt_off000142e5.bin
b422f869ff43276d5fa2eaa8cc3dfd1a1539c00b9b7731499b21f42ba89bf6dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142E5 11208 bytes

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