Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9ab163577ed85c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-10 08:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 68b23a3f30451d4f057d61a75fc94564 SHA-1: 16a25a1ca3f90b70c3176e0bd36de8a1a6d4af27 SHA-256: cc9ab163577ed85cebaafe0912a02e36370cf47d2c33c24e3d214fb0ac395645
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with multiple URLs pointing to PDF files. While no scripts were extracted, the structure suggests a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://aodaibooking.com/FileData/ckfinder/files/20210902_5C74E0E9BB9E9D92.pdf In PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c7cda0127---valitolutivojeze.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/mijilatenepomosiso.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/nowajumikul.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/9837256833.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613a26f956f30---tokirot.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/bevafovisujepubusasoluvir.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/mafejozelivolamijovu.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/ribupuwomojinodaf.pdfIn PDF document text
    • http://bluebossa.pl/files/file/kixetofodatiti.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/73152047442.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ujc8satsvko5po1c3ed3qe1962/misanejejedudanarif.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/17988030910.pdfIn PDF document text
    • http://sgpeo.pl/users/file/pagezomivewe.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/bazab.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/95aa9d1ff694e55efd768a7bb1e7dd09/fumopat.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/98899187385.pdfIn PDF document text
    • http://chayka-svg.ru/files/lolaw.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/74281600252.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/pikemipevijemutunika.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a6968ea4b029145a962f63078a6799d9/60092409483.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109041853387264.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/32058680478.pdfIn PDF document text
    • http://hbaoge.com/upload/files/mereliza.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/eq2nbcme2718319lelclsbnobg/kumifawavanawexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=android+control+panel+widgetPDF 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_off0000da1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 17188 bytes
SHA-256: 058e8b186918987c2366160b9046f6dc55d908d149c806d7a24a057a1bd5c66a
font_02_sfnt_off00011eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBA 10588 bytes
SHA-256: 5c9f63847111fe8d87fc5e86512ca64e6ffe78864e76487c72dcc468935c442b

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