Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f32dbbe53352218…

MALICIOUS

PDF

86.2 KB Created: 2021-07-01 01:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 288ae81e6527b8ac6df7f8531ab5cfeb SHA-1: 35f593e81cfe1af8d73e6ccb1ba1eb32dd8a1ea0 SHA-256: 5f32dbbe5335221884c03f224000d900f6f2779f833a1d0f0ff3ae4e76f44eef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware delivery attempt. The document contains a link farm pointing to various domains, some of which are hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the nature of the link farm heuristics strongly suggest an attack pattern focused on luring users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://cuanhuaabshanquoc.vn/files/nigat.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d994a0894ccb64dd17c6e2e7aba2aff6/17084394740.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607696b43199a---firalubapa.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/s4ufbrjj5q1t9op0sf8m9au4e5/45396456707.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/45064989403.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/fdab3f60579cc25d26d8b758a76fcdb8/83105763802.pdf
    • http://allprintusa.com/admin/images/file/90564270987.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092075e5a5d9---kajujisi.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/eaf11fcd875b66cb8ab50d8ffdb78129/80900527042.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/84df2c0e2afbcec728790fbf82939aec/bifurewudopamatikijadaf.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac882f940e8---31097713907.pdf
    • https://carlojans.com/cms/file/77705825688.pdf
    • http://ibb-online.ru/f/file/48746765244.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/15abbf5d64d717dd810c3b6ebc277387/tadagavuzula.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a935540db---letetibimenesodizapowuji.pdf
    • http://akcjonariusz.com/UserFiles/file/zazujotaxosinakugekulatun.pdf
    • https://tvsporedi.si/vsebina/38129909696.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f1d62b5eabae92125137456662bcc931/51696641273.pdf
    • http://teenaramainc.org/clients/875997/File/62062480932.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160847f6a77fb3---73871763221.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/66f5a710289e19a0a9c578415aee6400/zikonafotebonufebubemex.pdf
    • https://ancoraeducacion.com/images/81141603504.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607451fd82cc1---madupidagopomalamofo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=word+document+plagiarism+checker
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee6.bin
e40712f812a52948c937007fc5cb49f767155ee988b9d3d17832393f749cc60e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE6 11148 bytes
font_01_sfnt_off00010889.bin
498e145429ae25e29fe2568460e743decde624a348286651c62924830f4782a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10889 16636 bytes
font_02_sfnt_off000133bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133BC 16792 bytes