Malicious PDF — malware analysis report

Static analysis result for SHA-256 75da92a235f187a0…

MALICIOUS

PDF

76.4 KB Created: 2021-09-16 05:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 938c20fe362929e49c02f88307e1ee63 SHA-1: 5fb06e7884cdb6dc7d38b2d46aa9c18a963d9208 SHA-256: 75da92a235f187a0ca313fbb1aa42b1c42f87425303e20aa1700d04f836008e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised or disposable hosting domains, which are characteristic of link farms used to distribute further malicious content. The document body is unreadable, but the heuristic findings strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://vanphongphampmc.com/upload/files/54711149115.pdf In PDF document text
    • http://sowiik.pl/userfiles/file/jurotote.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/44835913430.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/sivodedogelanoloke.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e27cc5c76---63153605404.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17834309906.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/73784624428.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/nalewo.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/texafexafekovinam.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/89035612762.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/judiguvu.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210906184915_1830385616.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/24447279832.pdfIn PDF document text
    • http://temdientu.vn/images/ckeditor/files/lotomome.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/52117745713.pdfIn PDF document text
    • http://thecuriosityshot.com/76364069250.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/kkp1lk4vh4ubo4e4q0cepsj2l3/turumupebu.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/25835784520.pdfIn PDF document text
    • http://dkind.net/userData/board/file/wafogenumukigujuxuz.pdfIn PDF document text
    • http://martonelektro.hu/files/file/32140744466.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/zomidi.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/8c87f025caec16da56406626497e36bc/24087388538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+draw+peoplePDF 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_off0000cbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD7 10100 bytes
SHA-256: 784d69aad67ecb37430165d061ce765191b56298cd1a6b9fc7ee1dba1590ad04
font_01_sfnt_off0000e27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8D 16416 bytes
SHA-256: e78721191517be29abf28d6a32ffcff3a075d6ce6ab691901ab74523ef295965