Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d066795713e624…

MALICIOUS

PDF

78.2 KB Created: 2021-09-12 19:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 774064cd2cb0b91c65f5aedd20a18a7d SHA-1: 746f4a3c20a1b7c0475a8c972d41b38951c64e77 SHA-256: 37d066795713e624134ec236e816231995fbab1bcc51f4c7b368ee105872bce6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript and numerous external URIs pointing to compromised WordPress sites suggest it is designed to redirect users to malicious content or facilitate further infection. The presence of a link farm on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=episode+mod+apk+free+download
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130630713c15---69848483656.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/c1068fe7998cce43165dc121987480ef/81379514840.pdf
    • https://vinasimex.com/uploads/file/76262451977.pdf
    • http://sumbulefendiegitimvakfi.com/resimler/files/76885104075.pdf
    • http://tobn56.com/UpFiles/file/botixotopitukizugal.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/373f9a747d8f4f572abe08b4e66d8f8f/baguvawapu.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161332096b9932---69448782995.pdf
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/jitifafojutivojulo.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abe8d6d285---41986787567.pdf
    • https://tradegateindia.com/userfiles/file/28579961513.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396591496d1---17393668864.pdf
    • https://komunalno.vrgorac.hr/files/15521311992.pdf
    • https://begili.com/uploads/image/files/jivisopegidosifimegasasu.pdf
    • http://damnoen.com/ckfinder/pho/files/pamejedogopodoriwito.pdf
    • https://trainova.com/userfiles/file/tofaliwotorer.pdf
    • https://pakistanchristiancongress.org/userfiles/file/wolob.pdf
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/wofafonadiwepuluvuxoz.pdf
    • https://argentinaproduct.com/ckfinder/userfiles/files/dabisosemi.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353f6738cc6---vidawudekonelug.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/vorutopomenekeginiba.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/kt0v9jk5tk9e2p7futujoclh0j/9782125816.pdf
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/gusefeseluxozim.pdf
    • http://bivalyracing.hu/files/file/25090797726.pdf
    • https://renebeumer.nl/userfiles/file/93357338132.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caf0.bin
42ab46c4b581fc0c5a54b5a103dad6f464a74d4f7200b31ced0dfe5f846c0d90
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF0 18356 bytes
font_01_sfnt_off0000facc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 16792 bytes
font_02_sfnt_off000112e3.bin
d41532cade451af818ec2898f745c321780e2e1406a0d57c8aef20ce87e85185
pdf-font-stream PDF embedded font (sfnt) at offset 0x112E3 10720 bytes