Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2cbdd1a8de93a2…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 04:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3cff424ccdce4169829e9a08e9afb289 SHA-1: df30fb7317b01992d9538676a025932df4a58bbf SHA-256: 6b2cbdd1a8de93a2ea214014ff9214e51816795087dc038923c555deabf22b14
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple external URIs and compromised CMS upload links points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://ketchas.ru/uplcv?utm_term=wilson+hardness+tester+manual PDF link annotation
    • http://x04ydivan.ru/userfiles/file/64968429196.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fea9052f28---sidesikenaz.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/xaguvababelilenebe.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/dc902f9cbe62db1c78bc3ba6d4f5c50a/gatafekimo.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/25069248985.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098bac659b39---29472456044.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f58dbfbe6---kejarotamubijuxopiwotupuv.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/sekuxasatifam.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/11446675647.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796fa69299f---fevivibakafifizupi.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/43909227810.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/26429642476.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/visejinamuxarugop.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbdc777164---8970067303.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/pixotazubuligimos.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/6e1qtm2elhccmgqt5k9962l3sq/ropokugaxugerojenuratis.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/33292170904.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d5a2b82ec---viwunidolitowosurogup.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/wawutorukomijepu.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/27uaqt40fkhdn6okll56laqag5/jetufegari.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/topunenizuluwasurutotopu.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/928cf403974c25cd7faf54374286481a/54877738313.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210716_736B1D0B39DB9A53.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/cc20d73d16e91d221fec2d97dd18a80c/vaxasozanadaririrade.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/modotodi.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/8150087459.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/9cfabf3f67d461c1875e89f27fc08241/86345767043.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_off0000df90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF90 10608 bytes
SHA-256: af07fc0cf3938c7efcc6df7d7f44edecd79df15fbd24da5d2395230ec6885d8f
font_01_sfnt_off0000f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 18432 bytes
SHA-256: a4f218acd1ab179bada4ba529f3bff0d8a821b0c236f18b1bf8523b9b153d027
font_02_sfnt_off000127b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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