Malicious PDF — malware analysis report

Static analysis result for SHA-256 33db80fbcee5ce8f…

MALICIOUS

PDF

82.7 KB Created: 2021-07-09 21:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cd8475b30efc13e439aaad533d145619 SHA-1: b362be38ef8daf3843f9533bc271a1af85943b6f SHA-256: 33db80fbcee5ce8f90d0f909adb8e12b29679dd26962c0556b27735a467552e2
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of compromised CMS upload links further indicates a pattern of hosting malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://huntic.ru/uplcv?utm_term=tycoon+coin+ico PDF link annotation
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e724be7e7---mibazomigebosikoz.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/10842517040.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720af60a676---47186805624.pdfIn PDF document text
    • http://royalgroup.at/tmp/72045331256.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/db984205e1947285aa4f1be99f8b63ce/96647162267.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/gunitigi.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900006548e8---zevitixetep.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdcc6239de---46572547863.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9af7b93bbbe25e0497abe32b603a701a/25170274258.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a423c1390d---77015754812.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a236b998f53---dasopujinifetiw.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/ripebatugegatig.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/fc1ff6c9145d171d941f5514cbe46490/42530655751.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/fesimexogoxowome.pdfIn PDF document text
    • https://strechybenesov.cz/content/37419484743.pdfIn PDF document text
    • https://senhewood.com/d/files/wadiwubimazerinopenisij.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/dawidomivo.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/pevesokepa.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/d6d298b124d862b911ad2d71e2bf7539/niwazetiwesunopam.pdfIn PDF document text
    • https://chptravel.ir/data/file/36499412987.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/16604890445.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c2828f258---78691916841.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/tufexunutusebelufiwiwaxu.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/sigiwezewopal.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/daxojosarozu.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/75490025187.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/vekulurujowa.pdfIn PDF document text
    • 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_off0000e322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE322 9596 bytes
SHA-256: 6441ca6449171871da781bbe33c092cb6a514cc5e1e98990ff12c7b5fa945596
font_01_sfnt_off0000f7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F9 17056 bytes
SHA-256: dec484b84e03905d3e342967e6233f2f792d29120ded555551be37ab88e280d0
font_02_sfnt_off0001241c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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