Malicious PDF — malware analysis report

Static analysis result for SHA-256 1185f34eecfafeb1…

MALICIOUS

PDF

85.9 KB Created: 2021-07-09 05:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c835cb424b4cc5c07b96adb607ff013a SHA-1: eaf27246b584fee94568512a9765fa8d583c6b51 SHA-256: 1185f34eecfafeb133ea9743fec413c2480353dd2912c3018c39172f8ea0b486
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on disposable hosting and compromised CMS upload storage reinforces the phishing and download lure pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://technok.cz/wp-content/plugins/super-forms/uploads/php/files/0d7b82355f74cdec7f90c0fe94388581/23045503989.pdf In PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/86319112899.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608609959c9cd---tupabewej.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160894516205d3---69528091727.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/575be2735a2c908291fe0dc2ac16cacd/xatixufufivewulolofipewob.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/52806156103.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6b7a1b35f---34097234310.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///69735602354.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/f7065632408f4f7a027db251e58f552a/jumirokubuzigibutal.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/bunevonijeponir.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093deeb9ee3c---rolisavulivejilepima.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/lorovoxisibumupe.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/72007450336.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/pepebenibugufolapizuzu.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/24266688623.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c79ed6d911---pinakexerozifagadekatesa.pdfIn PDF document text
    • https://clubon.top/uploads/files/kijexu.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/nopesilax.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/9eb012d9a6ff1069ab72aa20582d7a31/38181654908.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/pipuxusek.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ts5gbrg69bugu4r918rfjpfcd7/korofobupepiribelo.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/59689520037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=high+level+design+templatePDF 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_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 10676 bytes
SHA-256: ee923f329cfeadf0d12f99a22d4b245825373ce453bc0c917c8ee6219b9d3df9
font_01_sfnt_off0001062b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 16976 bytes
SHA-256: 44f64baa261b69ab76678cf8b6a61e3a8d4e89cb72d239ed2e598274222e3474
font_02_sfnt_off00013288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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