Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cda6719e5f61181…

MALICIOUS

PDF

121.8 KB Created: 2021-07-13 20:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc87cc6984dc96586b4380669c455ac1 SHA-1: 7ea1a97714f7259b3b6c08dc02834cfddde29121 SHA-256: 8cda6719e5f6118139208d20ff395d3259b8ec1d1d93cc40dbba7affdaea925f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. The presence of multiple distinct hosts and the use of disposable hosting further support a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2783205541---5669177697.pdf In PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b715ba583b1---1945727355.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/15bd47482d8b998c42a08915807e4b80/vopupuzulezagipumogorazex.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///zunejas.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/84381730942.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/76176301140.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/70953954533.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/fagukewamavudadeg.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/69318451631.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cf6db670d---88396346631.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9293093b893945c42a7f6f499a12f4e7/sepiletumidunezet.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e64ff755203---52216132632.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/85670393251.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/5632757b943855ef317afefbd02f46dd/47080778279.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/28612819818.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/591a27bc458d371731801f18e85fba15/dusutafov.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/25432300713.pdfIn PDF document text
    • http://kasargod.net/uploads/file/97054667117.pdfIn PDF document text
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/pukoxezux.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e05c3599b04---8547164541.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/bcee226b9554e9de5c4ef9be090ac97f/37598018114.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160943e50b39b6---povuvekonesifula.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609425763b57c---10584622980.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/h3e57rrlsm1pvbn9oke49lm6g7/xobez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=puke+meaning+in+tagalogPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BFD 17564 bytes
SHA-256: 9af031e38ee3e84bc7ca8718f60791d336b6010e84de22779f753b6b8d74d4e6
font_01_sfnt_off000176eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176EB 19672 bytes
SHA-256: f72b7965f1d3d73451fa25367ce798a6a8ec7e8131e53778a131891987353996
font_02_sfnt_off0001a87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A87F 10376 bytes
SHA-256: cf6154d9d177cbd7a08425d88fe8074ff054f4ad3afc0d64cd3f10b10247e7de
font_03_sfnt_off0001bff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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