Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa63c8f0a2c1dd0…

MALICIOUS

PDF

76.9 KB Created: 2021-09-04 11:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fc6d47d8feab852b70e81bd2da38c2af SHA-1: ce4fc7e1942534cd46b2c00d3aa1d1c50d105f2a SHA-256: 9aa63c8f0a2c1dd0abdc0679f10854081b114ec87bc29e3ff0b94756d6351aed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=american+standard+5000+furnace+manual PDF link annotation
    • https://sjalikave.hu/pictures/file/51942744623.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/ponafaj.pdfIn PDF document text
    • http://mousike.it/img_ins/files/jarosuli.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021062000083573499.pdfIn PDF document text
    • http://webursitet.org/Files/file/61453369111.pdfIn PDF document text
    • http://djapm.com/userfiles/file/vaxeju.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/16238386442.pdfIn PDF document text
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/21703903062.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b954585c1---nutelanunefuzoxazepe.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/8546155c332f24d46601de37e363431b/56241028544.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/d12e61b4e6763969c63893a56b9ceba0/pekilefefaboxezobak.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/wawiduwidavo.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/64fb483a93fd4e065e6f580611d8afa5/91257271238.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/pojeloxadazi.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/098f412d80b1fbcee594042845881063/kibidedad.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/c523b1fbd72b54c2f94fb5cfe0165e11/xagopuzesotupazib.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/50529970689.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/fizopode.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/punogelavu.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/kakiribugo.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b41b2c6690f---93858298211.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/demumezukiboxokujofagizel.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///pinenidemajidamumeva.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/ganetirajelegavotege.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_off0000c755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC755 10856 bytes
SHA-256: 899ef1210d55a273989999578ef2d8636c634ba6da5feb062c1399969dfb4022
font_01_sfnt_off0000e072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 17360 bytes
SHA-256: 59c2d49a7a768635f158a9db1b0cc31549b5ae2d8db5ce88a0607b3af85bab41

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