Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b1c5203029b9a4…

MALICIOUS

PDF

87.3 KB Created: 2021-09-01 10:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 37e95376a300ca37a897feb8a52c8037 SHA-1: 452db0936f9bfed5b74fe68e9255f7f92d8e4d5a SHA-256: c4b1c5203029b9a4e3fd56343e48a3565d32dfcda0ebdbb6bbf71006039ffdbf
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload storage and other disposable hosting sites. These links likely lead to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://aldobini.it/userfiles/files/ledusujapepimufili.pdf In PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e02da078d31---gazukoforigonaji.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/62282041902.pdfIn PDF document text
    • http://cochu.net/resimler/files/93175444355.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/tedewosepul.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/2c61b7d3c23eb671ffd2c65b00beaba3/81117333561.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/26341023705.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f0bec96ff---78555610594.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/7316150086.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/66491860762.pdfIn PDF document text
    • http://email-database.info/userfiles/file/20051875566.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e707840fdd---popofi.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70eef11b24---besutobezel.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/63851629682.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/331971634.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/11892398238.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/fawow.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/memofizuwogafowelak.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/doxerab.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/86477248568.pdfIn PDF document text
    • https://dm288.rs/slicice/file/24618812233.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609529cb8df91---36268365322.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/83250594279.pdfIn PDF document text
    • http://brukbet.com/user_images/file/bizoz.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/6354544634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=river+dry+cleanersPDF 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_off0000eef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF3 18676 bytes
SHA-256: d70880ef3de20f64f750633e502ab567d078e9aac1c267f466fc04e14697b4e0
font_01_sfnt_off00011ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF0 10372 bytes
SHA-256: a6f9eaf0e4e7fa41e62fad80edf6d2b19f7a76c18a9fed84b2e8b245cacdf335
font_02_sfnt_off0001367c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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