Malicious PDF — malware analysis report

Static analysis result for SHA-256 3511ec7494975ff9…

MALICIOUS

PDF

74.5 KB Created: 2021-09-02 10:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 702cc816225346566984b4cdf8f9b66b SHA-1: 9a557d70500090a5434e90e26aa7806467aeff10 SHA-256: 3511ec7494975ff93212124fc6d32b14898925f34ac71784b105dd4ac89d7e0b
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160f4cd71a2d3c---zozixovamugoponusikes.pdf In PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/88805236656.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/694724502ec6bdc54c6a15693777f5d6/22774498276.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da738b67c2---53115231641.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/84104741358.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/90207024250.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/0gnmssfpldcrrlde5ulle29p46/32980523061.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/63666c7e878fb75150120677bc71b3a2/53637218083.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210825173109.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/67400774353.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/5f7c78816399132c8ba2cb9c16ac4282/fevurefugogorimojunowined.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/26885303994.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/zulosakabidap.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/livufonadegovubuwebivope.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/8643102112.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4bbbcc6a1---murawiwogo.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/numegidibiwumolezovep.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/epebm7l1pheuf145jqk52sgcg7/folaremez.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/b60640e7031f210d233403ed70382da0/leminakitak.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/43844423801.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bdd07da822---14950926531.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210706211452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+dark+side+of+calvinismPDF 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_off0000be86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE86 17848 bytes
SHA-256: 32fe56add4a16ee1e2268820eb198b420780be84ecd1743096ed8659089d6a51
font_01_sfnt_off0000ebcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 10764 bytes
SHA-256: ea66d1fc73760b480b5a78e66a6dfda58568176c1b75f1a24ffdb0cfeeeafd76

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