Malicious PDF — malware analysis report

Static analysis result for SHA-256 38197a36d89486db…

MALICIOUS

PDF

94.4 KB Created: 2021-09-04 08:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c451d8d72cb87d52897de95a241ef9d6 SHA-1: f5eeeaca816bda450096dfc5ca590742737366a4 SHA-256: 38197a36d89486db905ef38e86de4433a7748953cc275ce939e36a87d046cef7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to compromised WordPress uploads and disposable hosting sites. These links are likely intended to redirect users to malicious content, such as phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://philabc.ru/uplcv?utm_term=ora%C3%A7%C3%B5es+coordenadas+e+subordinadas+resumo+pdf PDF link annotation
    • http://vhz.cz/user-files/zupunepejaberubabaj.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd10eb48c---23240133531.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16079d94ce20df---59436318417.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/26833680566.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087773ac9469---38272636248.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/zejefudiwevakobawakuma.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/82861162011.pdfIn PDF document text
    • http://dzbnf.com/upload/file///tipixedowowafixakesinik.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16100597bdf5be---jorobik.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/xusigukozobu.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/fifuzawinepifariwogavopel.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/vufijad.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/15250436288.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/xinuforutadunifeji.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d245209a4b---15366655176.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/jopot.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe273f34b69---37646339179.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/dofinowalutilitefezos.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/nazumeruj.pdfIn PDF document text
    • https://chv.vn/userfiles/file/14092401795.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/vezagefovapewegodul.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2098b207d---28560146934.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd6700e2e3e---45057419133.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/72858819910.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/fafixenoxiva.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e280cc44ca5---77086231173.pdfIn PDF document text
    • http://toonesk.com/upload/nefosazipefoguz.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_off0000ff91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 21920 bytes
SHA-256: 7b1d41511728d2e558971302c04c8244de2a098a1c9e751729293cdfe1fa9f30
font_01_sfnt_off00013724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13724 11324 bytes
SHA-256: 8826b3e5378733e7ef2bb6f2ce476e7b6873c567a2a24845f92453d2260b1d46
font_02_sfnt_off000150f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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