Malicious PDF — malware analysis report

Static analysis result for SHA-256 c862542d05ac7472…

MALICIOUS

PDF

94.5 KB Created: 2021-09-05 04:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 682faea8abbc05b260188babc49d27ab SHA-1: d75dca2f9fa36d248ce485d3d2161b8217fbd580 SHA-256: c862542d05ac7472ac4652a3631bbb7d7d5409476adfea925d5ed81cb807e136
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm, directing users to potentially compromised WordPress upload storage and other unknown domains. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d6e92287ae57903e65589a8fa696dfef/fimodimapirawisuf.pdf In PDF document text
    • http://hongdacable.com/d/files/21377135891.pdfIn PDF document text
    • http://k1a.ru/images/files/file/xipazope.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/28043763580.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/9baa7bc9a5f4fb19b0e6e9309ee6cc4b/bafewopofapozatixodebid.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/mawimivevanisuxiguf.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16082213e944a0---91654297388.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946d43daaae---93629924874.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2a35b9324---60420882378.pdfIn PDF document text
    • http://khocabien.com/uploads/files/23981884104.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/77855959013.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/5b64jbcudbq4lgkn3jle55shhl/balisa.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa116ff3bcf---womonulotuvepusujenazunow.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/zenogeb.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4eb078ca5---63658068130.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/gagewawifivedekexexilagas.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/019a8589315462e9ff1a5f159ff8baeb/fofepefudi.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/jadetizu.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/3b4ad51541ffc24c5a8fb0f7dd00248b/93539627456.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/e90ce63fff26944807ab392e74286040/dusoketefixarafalivo.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/sanetiwa.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/58534095778.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/87181755240.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b699daec6---navos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=metaphysical+poetry+pdf+filePDF 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_off00010ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEB 10720 bytes
SHA-256: 4abe13eae67272ecc54f6a56c3dcd12c4071ed27a94788035ad0c45c05478b36
font_01_sfnt_off000125b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC4 18148 bytes
SHA-256: 14184041cde4e15bbec4ed40b2e20f7cb67507c36ecfa3249cfed758fdb4619d

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