Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a342765d7d6ee0…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 13:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bb2a3d4a54fbf1b9f498f8c15a9945b0 SHA-1: 0736811cbacbb62b8c8a8078ba12f9634445847d SHA-256: 96a342765d7d6ee0f18db250bd89e3d1ebbdcd0f2e2a189ae6484825fff221f7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/edd4ce86d1dc376590b4cbd963d6bbed/16146728697.pdf In PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/f0b2bab0c88b23d80c57016c2a36020e/dulasefud.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/duzofejuwu.pdfIn PDF document text
    • https://triosms.com/userfiles/file/kinavunufepofeza.pdfIn PDF document text
    • https://designclarf.it/file/furulabogutozo.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210619180046672.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46f81f411c---18217101698.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/nhmo14kds2sn9v1aekntq77umj/guvinenokarofubepuv.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/fogulirabafotalajumozemep.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/vaxaperuwitofafosirix.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/ziwunud.pdfIn PDF document text
    • http://hawkins-kearney.com/clients/f/fa/fa1934e8f236f3272fb98c88546bd003/File/88583234589.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/jebosopefogubun.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/34610570978.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/fujsoiu6lrtge1ecvg4lk8pto2/vupomojuretilupeliz.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/49265489343.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/e9cff58ef296447c30796ff27d4899f0/45563769159.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/49710761052.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160855c6a95fee---ziridit.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/vefili.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/48475715392.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/ed5d3b7ee288ce07d5519472c93fbc48/rujotaxamezetinivivuwaziv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=paragraph+writing+grade+7+pdfPDF 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_off0000e518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE518 10580 bytes
SHA-256: 51e94040cad379f3d628300c5b48d4cb67f49dd65135eb3d5fac7ca6c848f10c
font_01_sfnt_off0000fd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 17352 bytes
SHA-256: 0bc009833f99bb73f7247acebc905b946f55c5d6fde96c3603427d70b488b108
font_02_sfnt_off00012a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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