Malicious PDF — malware analysis report

Static analysis result for SHA-256 d834e4e97a921e5d…

MALICIOUS

PDF

74.0 KB Created: 2021-06-19 18:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fc678164fc71bd737691e86096cd5d01 SHA-1: b0ea57b3f40bb29ca8fb64b2f7994dc75c5df6ce SHA-256: d834e4e97a921e5dd398da19d5b1b6840aa7bce919cdb2d25e2469ff93195bf9
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as a phishing trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farms suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://446888.top/userfiles/file/34711625938.pdf In PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/kl0gj10hi9mi4hg68sq758qj50/zakufe.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/ratadik.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/guxavanava.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/b92eb82153397bbb4bfed9e6487fd805/mukeronopa.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/nidefuwow.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607de90f3c918---vudekure.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/c5adfb3342b37777f82e1daa72614cd5/57552708528.pdfIn PDF document text
    • http://novichiha.ru/pic/file/88781404898.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160850ddd29aec---67327225544.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105030010239511.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/90700395520.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/xenunos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=superlative+words+listPDF 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://scripts.sil.org/OFLIn 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_off0000cfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA0 5208 bytes
SHA-256: 263bbe933ba41c912e79ac90c4a2eb4e18a7f1a7aa4b1c33c06598c5c69fdd1f
font_01_sfnt_off0000e174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE174 10644 bytes
SHA-256: 9f01cba4976352e64ccbb2f048889ff0650e6542520b70332d2640f98fbc6564
font_02_sfnt_off000105da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DA 16248 bytes
SHA-256: cacce353daa52449aaa2dc03ff14e12d7f37b8e2e541d6bae97b449db5f5a003

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