Malicious PDF — malware analysis report

Static analysis result for SHA-256 df69290a3fc0904b…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 09:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 173836957db05bfc7ffae2805ad208d6 SHA-1: 168aefe3107ce78ab919856d65c62f3b0d083191 SHA-256: df69290a3fc0904b1f625babdefcd35ea48a361f6ab4b1f5ce99ca997ab2f80c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links is the primary indicator of its attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://infrive.ru/uplcv?utm_term=swords+and+sandals+medieval PDF link annotation
    • http://surausa.com/uploads/files/26544520754.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/latiritexapilovivutawe.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090613514373499.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/zususukujebobij.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/69766193514.pdfIn PDF document text
    • https://webmenuplus.com/images/file/ronifodirozibowos.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/64691334530.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/e5ad57e8a6bd8a8db3de61b0ed2a6113/rulozifokulo.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/93889098578.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16134606ae771a---10026088968.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd15766c75---ruxakamafupuxapedusaru.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/majidadegelaperunukuw.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/rekafezeripusifesela.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/kuhj3tptn4kvuvu19qnd58mos4/zosigokudi.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0db9b813d1f115b863b1991b6271e763/bunujiz.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/zuvewozos.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20219171255261832.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/95815332704.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/91523811412.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0e55ce2bd---zivagurulabe.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/76400447405.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/kirekivutas.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_off0000dde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE6 10536 bytes
SHA-256: 01f009ecbe552f94167b8a8229f9a296e904dc3459dd877b5c10641f1302624b
font_01_sfnt_off0000f5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DC 19096 bytes
SHA-256: 90c03f93504dc2603a8b5aad30b3a02869072416c9ce5032986892724af1194d
font_02_sfnt_off000127dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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