Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fc0dd2238c4878…

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 07:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 660ea4ee64172318cbedad8c2dacaf32 SHA-1: f8fad018e876eef1744bd3f236be3ba164ae86b0 SHA-256: 75fc0dd2238c48783c8a82fe952e5b220b955e23e0fee2777a9e6f9163f66fd2
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous URLs, many hosted on what appear to be compromised WordPress sites, suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://anhuifan.com/upload_fck/file/2021-5-14/20210514092656703653.pdf In PDF document text
    • https://proxus.nl/file/zodugoromikolizenataruwi.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160821d13336d0---21724887005.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/lubonuwifi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/07842dde7333a043ac525c0fc7404931/tibozasekunadirozetorosen.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/xiguxigowonimoralages.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/71841812445.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/nobegoke.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0da7cbb08---46884569888.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/53826564378.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/wogogadosipotagazagila.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/6985983809.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/29289478728.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a79b2b6006---40511930479.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a95b4d6d0ea---sabexitufumosote.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/losetirokinotiwozatimi.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23da2569f---radesexam.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/838e0c4fc4d4539925a71ddc12802e1a/mepajidujak.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/rikijakulol.pdfIn PDF document text
    • http://waltripclassof74.com/clients/8/87/875eff38522a6836d9fda94c5a2b6b26/File/wekikegudavigawawudabin.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/18190531889.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/ac3f1b4e08b10417afe4cbec91f02944/98256929915.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/96d48fa03dc9a469926e45fe91e8173b/82761087468.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wosamanibejadi.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/xevirijoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=set+screen+lock+on+androidPDF 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_off0000ce73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE73 20068 bytes
SHA-256: 61e5e1b6745d6c661562b3f10bd5de4161a9347d876af3fe702bab6944770a0e
font_01_sfnt_off0001029b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029B 10528 bytes
SHA-256: 982924bab3182e6f79ad1065b4387c53a96a1d4a6f1989278ee43f4ce18f8c91
font_02_sfnt_off00011aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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