Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9c26a0f1f0b55f…

MALICIOUS

PDF

87.1 KB Created: 2021-07-16 20:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6f97ce8dd7e4df25aa8ff20f9f0bab55 SHA-1: dcb0aa250f6a8249055b2366bc775e69154b9fde SHA-256: 9d9c26a0f1f0b55f71f5db74f2b9d7e72b39a3b92045c1d444412c8251078356
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The presence of multiple distinct hosts and a high number of links per host suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/2b99868b64d7e016688d7292f04a8ef6/vekabaw.pdf In PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/125iskpfvr0nc10nk1o69iv19d/vujepekumometipudisin.pdfIn PDF document text
    • https://belloverde.net/emailer/file/78076945262.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/83518944328.pdfIn PDF document text
    • http://abworder.com/uploads/files/dasiniketetamelatud.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f967cfd02b46ac923ded65f74d40472c/zokezumuburufuwinina.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749e911ad48---relefuketolipakegenajule.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/malumobupobato.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c019563c1b8---90010956208.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/98229172799.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/0lvh3lh0jdrk5d332l9d2sesv8/nolilib.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/faf1485b7cbfc52953452cc855b0874f/40231059465.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/8147280197.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c644f77724b---zovujijexukasiralexugi.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/1394924081.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/74001890592.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/83c2448e4aa3a93f89bc24212b1f754b/gexumuwuwipibuseludufo.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///filulalilinofu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88110e037c---71268668720.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/gobosufuvowa.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/1a99dje2e0kf9lb6md37ptug41/75854693542.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/40554600695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=libel+action+meaningPDF 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_off0000e6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CD 10404 bytes
SHA-256: 3cd0b729da8b21c4a7666397c10378fd4c33974133a776e3c34d4bdfefca2540
font_01_sfnt_off0000fe56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11668 22320 bytes
SHA-256: f834259a9d944a76761682997c1b5a67f4896fe78267224cf38db889c15ef1b1

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