Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbfa91530cdaa90f…

MALICIOUS

PDF

89.2 KB Created: 2021-09-02 05:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 513786ed0752e1688546e9c932589e9e SHA-1: dfee5d6f0ffbb93d462fe2ec6d19cd458390cdbe SHA-256: bbfa91530cdaa90f389122c0ef63187c2f791cac845c24342845765e2b886ef4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/2a8d4e0a48e6af3b8a271a5ad1ec9101/kopurojosemebiroreze.pdf In PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/riwibafuguxaramuvuputuz.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/bujoxabigujobiv.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/bc09e188eb51acdc73d3d4fe954fbe63/xilawewewirewasejegamujam.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/98461650344.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/3252811136.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/59mglf8f9sarmvkbh293tkaj96/luzipenu.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/bapusewebimirinakibogeb.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b85ae0b46---sagaletid.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d47c184a1---74564372803.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-27/20210627043253481731.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dhhc9b790pl6achtc0ken63501/gabutulodika.pdfIn PDF document text
    • http://babamoleskine.com/files/file/velekunubofewuterafuve.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/693c4256d5aef2bfea3c8e5b4de8307c/75505768273.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/c56bb6ca836d4b3b65739151fdd7d8e8/xopejexulijodewe.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210714055822.pdfIn PDF document text
    • https://kristinanamaste.eu/files/xevemaligotobasofaboj.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/65389258840.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a34109ea6b5---fajojupufevumovexaf.pdfIn PDF document text
    • http://pi-consulting.ch/download/89394397063.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/16768539706.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/vabesutekeduva.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/fodefilufoku.pdfIn PDF document text
    • http://abnicum.ru/files/file/xipofumegakuvinokek.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098841800fcf---zanigep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=endobronchial+ultrasound+guided+biopsyPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/kenirebibepu.pdfIn PDF document text
    • 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_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 11132 bytes
SHA-256: fd98e6fd1e8773be818fc4fdfce5a4f2b26e68a99c158f7a13b25b79e5dadfb8
font_01_sfnt_off00010e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001265f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265F 18696 bytes
SHA-256: 8b02af3440745a207e54d4e84cd8b2e3871a6e7f00df5b5eab307941172288ea

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