Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf989208dfa03b3…

MALICIOUS

PDF

91.1 KB Created: 2021-09-16 13:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ccdd219a78a60e2d35d610903c0cae1d SHA-1: 4b6a468fd46dca31d2c049ac58c5d214296cfb59 SHA-256: 7cf989208dfa03b33dc7c622d304c4a1621c37d59706d1e930776caf09437af9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised CMS uploads. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://divinenine.net/userfiles/file/kexafilirizubolurepizis.pdf In PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/nukozixoj.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/38756100743.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/kigafuvide.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/71721694471.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/jamazasad.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161363d54623b4---kobujinajid.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/momepuxaxejijedasirof.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/fubezavikezidobofo.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/gusugumibagasisebin.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/sowumaramude.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7a4eba5ec---sefizuzaruj.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/xowalixopevekilusel.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/megurozerisemox.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/36203984248.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/87741795374.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/60894849964.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d2098038a---wixofazenuzesomanitu.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-3/20210903160106195508.pdfIn PDF document text
    • http://sdes.in/uploads/3333883815.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/julezobela.pdfIn PDF document text
    • http://napiarsaigh.com/images/19122933173.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/19904761549.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336e5e848c0---fitux.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a6b691937---50255423694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=edycja+wideo+na+androidaPDF 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_off0001005b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005B 17996 bytes
SHA-256: 5f26e341b688e6248f30959743cf660e1a2641780ba9738883184913c6858143
font_01_sfnt_off00012de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE7 10364 bytes
SHA-256: fea96e87393e6b8633429ae7d3bd1f31d1295d39ce0407dab5d70a666e2c28bc
font_02_sfnt_off0001456b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1456B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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