Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bce1d7fdff77ac2…

MALICIOUS

PDF

147.2 KB Created: 2021-06-27 20:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a8e2ce86ca55fbd7d5d818894e840e76 SHA-1: e70e5ead561b44850a473fa76de3c687f9d8674a SHA-256: 2bce1d7fdff77ac2b660d90e1db0f10c617b2d2c80bae624ac030e21bfeab958
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm pointing to compromised websites, and ClamAV detected it as a phishing trojan. The ML classifier also strongly indicated maliciousness. The numerous embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 http://leinerpakgelatine.com/survey/userfiles/files/18887975801.pdf In PDF document text
    • http://weifong.tw/fckimages/file/xaxiguzamopanel.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1006b33688---takotoxatu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e01663f25---99630730749.pdfIn PDF document text
    • http://christopherdallo.com/file/84164668093.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/87782750676.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/90601605506.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/1ebd2me2lb0mb8hqqaoa7bpl82/bezitevowarir.pdfIn PDF document text
    • http://www.toptehnik.si/images/mumugolepimajap.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5d5b3a477---pojuzumuvuwuxufixopi.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/j78hfom26tfrtgja14g6m87tvl/jutuzop.pdfIn PDF document text
    • http://esistore.be/userfiles/file/22967907787.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086e05b116d1---xujifusubu.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/c5cd1d39e7fe092861b8521dee500b73/48335931611.pdfIn PDF document text
    • http://cwesp.biz/upload/file/52027843477.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609847b1f1a04---zukifo.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/5bfea4900aceda15373416423a1423a1/wivopasilu.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac1cf534af---xadomumuguronujeboze.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/af4d78d917i3m261ktpfnphp18/5127611161.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160704d8624a79---piriluxenapogug.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0fb9aa799b19f751beafbe06002b5b6b/79919463866.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/639c8e881ea387cb3b7a192816010772/zejanuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=letters+of+william+jamesPDF 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_off0001dfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFAA 10444 bytes
SHA-256: 41218e2ba4dddffabacd84f072a79c4807413017fb821f104c60ac4b50b5c976
font_01_sfnt_off0001f765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00020f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20F77 18892 bytes
SHA-256: 2fc9da7b5bdeddb14537011eb61756276dc1d3e8422d295733133aeb60cd8396

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