Malicious PDF — malware analysis report

Static analysis result for SHA-256 b991602eca693a03…

MALICIOUS

PDF

86.8 KB Created: 2021-07-26 15:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 34eb8868f1c785d2189d13f34d6ca129 SHA-1: a118b5571d04287c352c129819e7c6070227fdc6 SHA-256: b991602eca693a03deeb3a8dc58662ff62d095855abc8a92ca70cbba451fdd42
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple domains, some of which are compromised CMS uploads or hosted on disposable domains, suggesting an attempt to distribute further malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://grandchainfamilyfoundation.org/clients/85333/File/2523493241.pdf In PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/tofupoboriles.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c89e985262---34481925976.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/lezetule.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/9fb496c62ba91977d1eb95941e2de8d1/81005425514.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/jefafazovofozov.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/cdce94110570f24882512e37c8bfadc1/fudadijepemow.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072dc1886e09---rosewo.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/80996939107.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/sizawap.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/dfbf8e49ded79349c190ef6d43596ebe/pesutilefimojufuvob.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160944e8d5362f---bofated.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/c6f7d617fb82ef56c7dc102139e70f50/31866038100.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/70557094583.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/fodazutejevezeganavup.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/wewazifabezudonoparonaju.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/kureremofawezojinazuve.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/gha1lprbuhjrsfck4idgmtqf9v/pavepizigipara.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/5764050260.pdfIn PDF document text
    • http://dyweisheng.com/uploadfile/file/2021072411031773499.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/lezubesupo.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/d5e3de2ec8f80d0fa9c93ff8f286b3de/gabipibuletamivikaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=essentials+of+english+grammar+and+composition+5+answers+pdfPDF 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_off0000ed04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 17456 bytes
SHA-256: c649d18c5303656369e1eb53f527bfa587df03ca85869ea1bf2c7afcf867cb3f
font_01_sfnt_off00011a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4F 11268 bytes
SHA-256: edd28ccf58d64b774b39020d38bf9cad7b6e6c4127efdcbd7bf87fce718b0e14
font_02_sfnt_off00013479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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