Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca48aca3d07d1c81…

MALICIOUS

PDF

71.1 KB Created: 2021-07-01 14:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 11dcc5b0e0155c0595669d019b70572b SHA-1: 3af4b843121874e1a5811e79e9edf1e0ae79b6c7 SHA-256: ca48aca3d07d1c8106deffe61ab073045006b9a8dbd6e394b2853a1dd5856af4
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious content. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or malware distribution vector. The document body is unreadable, but the heuristics strongly suggest a link farm attack pattern.

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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b23acf414de---xemodux.pdf In PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ejbsc8s7501mdcmagih51agefs/67551280976.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076580f5e706---vudamukotamovowunesurod.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949a72caab3---38801210557.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/83333950937.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb0a2d1474---zulovojosopojetewe.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/7093a8e5c4d78cc7d40974e67209e463/lotologubuvila.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/8444a9d0afe00271a25c523b3b8256d0/12886006501.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/dagowegomiwagem.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2b2dfea1bb1e91c3bd5bcb144e4a11a6/95630513758.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/2475935204.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/e58e7b1601e404f8a79aa87eafbcaab7/literoguxagipivaz.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/693af2a4df7b81cabdfe0eddf6b55ebb/30368485669.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/dae0bd8e0b458bb4286c76ef85e94649/72662439672.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/j7pj2rq0svvb4g7johj5kpv00b/79195477151.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/95295023761.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/45814a53ca91f415d35406dfbad6bdb7/47577032630.pdfIn PDF document text
    • http://jinxinghotel.com/uploads/files/vesatudezorun.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///202163942567336.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/motada.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd0a1b0346---dosomalipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mouse+trap+game+cool+mathPDF 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_off0000b85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06C 15232 bytes
SHA-256: 9932f16b4e3bc2a7b937b5a0bcb4449d77b64bf0e66b69717bd85a2008b164a1
font_02_sfnt_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 10720 bytes
SHA-256: de54dcd4c1038086355b72c8754ff7529d700aa90e98c3fa6ca435b5e2e5ba53

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