Malicious PDF — malware analysis report

Static analysis result for SHA-256 802dc9acec830bd9…

MALICIOUS

PDF

93.7 KB Created: 2021-06-27 21:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b25afb2d3c5327472ca8b884c6331c8f SHA-1: 98ce2c306a721edc9c8e81e5ff8ece0fd0f4ddb3 SHA-256: 802dc9acec830bd98c0932928dbcbcb2c6ec896e878b1ae866f0cb2584031553
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/kl13rok4v9evfvjpkvfutl1bv6/23932279591.pdf In PDF document text
    • https://senhewood.com/d/files/gajubotepusinigowolobuluv.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d69c7d21e1---tazizigoxen.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/557c339gtj905ktacm6jo21ga3/849659571.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c22b7259ca805d8cde86a5aa807db841/2687039303.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/japunizajesopujemab.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a02d326bea---fovake.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608883c5b31d3---2331894559.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccf20bfe2f---nupegodirupazana.pdfIn PDF document text
    • http://raczcsalad.hu/files/jowomelogutenemog.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eff6a89433---zepugunijejejoto.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/icn5p6l7k868hls579al147lc2/2194038771.pdfIn PDF document text
    • https://soliangco.com/contents//files/98305642859.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b301144a14e---40789887112.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/89992252756.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099606f58970---sosojokelipebudivuduj.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/marijo.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/lofanag.pdfIn PDF document text
    • http://axwelindia.com/uploads/jolasabolopakumifitu.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/f7dc2d39b26d515a213d074dd7d62687/fitiwofakopozagosa.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2fu5ipfktoc9q77okdjse17tp1/19937140988.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/luponalobukajusadiput.pdfIn PDF document text
    • https://autoparkalbanese.it/file/45542114345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=equation+with+infinite+solutions+examplePDF 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_off00010af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12307 10940 bytes
SHA-256: 81341d2eb5ce8016837102b40bdba798831cdea6e2b92a3e65643584f80c6dee
font_02_sfnt_off00013c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3D 17188 bytes
SHA-256: c49d4f7883ad3af9cba7ce608175b7f5d56b01b530974e352d2906e85245a95c

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