Malicious PDF — malware analysis report

Static analysis result for SHA-256 331454ff5fe15f25…

MALICIOUS

PDF

90.2 KB Created: 2021-08-10 20:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 887eda7702a1392ecc46390676ebad77 SHA-1: 848f5828867475387f80b7a0c4fad5e352392805 SHA-256: 331454ff5fe15f258d548119e5e44f8d1cde5a5b1b5ac84e2c97d33d73cb3f81
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites used for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=how+to+say+love+in+numbers PDF link annotation
    • https://digireg.ch/upload/3625436758.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/32988b700616893c1d12384234054808/59705671440.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bfd22645b---rodiritedinix.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/81b8dc0227a4958a87434fe2f3361877/65197768049.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/cuphiqn2lfd80171v6fif5qigpml9b47/zugekasateberijovovoxodo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zepivazugafijaxoxapokij.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/sifiruvumijijuruwux.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/563b98aeea2d0a73d350cb8851c61e46/gabikuwu.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/xisijax.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f80bd81c2f02af47c022034b7a4c9a19/10175640371.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/kadisuwubemovorule.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/39850764953.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/jarutelosawi.pdfIn PDF document text
    • http://thevale.us/userimages/zivul.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607e224584fe2---79476046550.pdfIn PDF document text
    • https://amblamy.ee/upload/file/16678373058.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/zivasojijetofaped.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/43716644511.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609894de023f8---xixififonibos.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f09516199f3fed364a82170fb57f5f2d/nifudatularumezu.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/e7b319397b44fe2a34e1868c6d287854/74251714994.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210718_050530.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/95862857387.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/4478ad1eb7e92c6c7fb7509205b7e33a/zevixamixikumadunusanoz.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_off0000fd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD42 10768 bytes
SHA-256: 2c501a6c18e21edb2b4ffe214ad277900ab97a85cf1042ab5d4b56da1724cb45
font_01_sfnt_off00011608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11608 16800 bytes
SHA-256: a804176fb11915b7ff65873be9d2ed87974cf02673109f440447ee1394ba7c76
font_02_sfnt_off000141b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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