Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab80c198eaa7836e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 17:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ca16180bae944efc13d7e21ee302862 SHA-1: a6ca281785bf30ba2826db5721eb8d6885bfd472 SHA-256: ab80c198eaa7836e0b59a1d4ba06544c986d122ef0d49704ec6859b0f64e6479
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to lead the user away from the document, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://rallyteamwalraven.nl/file/darajumanakat.pdf In PDF document text
    • https://wheelmartthailand.com/image/upload/File/28070282838.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/75463572210.pdfIn PDF document text
    • http://sayarbobinaj.com/file/ribamedigibojusak.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/pulogezurapis.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/7988277711.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/bdc10126c2711d857ea9fb29b9b671b6/kofuzoluxomugasu.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/19206361911.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130be1793ca2---tafaxezonodag.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/xexabobiwafojunixibewawe.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/jototimokekusolegiwalev.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/82261304002.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/nutet.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136389700005---52209963475.pdfIn PDF document text
    • http://yanartextil.com/firma/files/62891330307.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/wulefivazimeg.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff937cf26c---21670831.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3e4d9d02f---30557459086.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/23415554925.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/93026497637.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/mapisubejedeg.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/70176061868.pdfIn PDF document text
    • http://ud2-140.com/files/kuniziselo.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/1960546895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=preface+to+lyrical+ballads+by+william+wordsworth+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_off0000d6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 11124 bytes
SHA-256: fbf94a39455dc428d9843f80f6759cd6bb80af9294a3dce95022d0a6a8f94b2e
font_02_sfnt_off000108b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B3 18232 bytes
SHA-256: 72ce21e091e34c1eea2768d1413e655efba114d6434117ed1aeb4edec65ea377