Malicious PDF — malware analysis report

Static analysis result for SHA-256 8663dcfaeabd0261…

MALICIOUS

PDF

89.4 KB Created: 2021-07-23 09:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e51fc404e4f4bb7a78c3f974ff649378 SHA-1: 6d61cb2cbcc63c1fdbfad1309e91d20a11aa727a SHA-256: 8663dcfaeabd0261c05f9bc3ddd6fe57910ca12ca980713171321d645784f2bb
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external links, many hosted on potentially disposable domains, supports the conclusion of a malicious lure. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • 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 http://parfumkin.ru/files/files/79316569602.pdf In PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e551b40058---xasegogafagu.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/sipeverofuxuvofuwaz.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16073a0c5351dc---xibedogose.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/c6aef1d6b3174450398f2010a5b68161/pufasibireluponat.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e5308bb01---81640171072.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a32042a90---savegulul.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae108d090bc---88593890504.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/jarofaxurebenowesed.pdfIn PDF document text
    • http://cuiquji.net/d/files/9919301491.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202162943515143.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e87bad93bbe1ebb23ba7261761d065f2/40375314088.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c372b877b18---87266958127.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a06e8413f62---48977583025.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0780d3674d---serunanoxuwobakowani.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/67bddd722fdb72054a30c55dc2e70038/44662027479.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a363c023b45---23152122978.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/tojuzovetubale.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608205e4038b7---pusuj.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/80241945498.pdfIn PDF document text
    • http://imi.vc/upload/files/fowedebavin.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a01eaa6cb89---24693152871.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/jnpo2lfospkcadfsobcoeiskk5/pesawizaxolirakevuf.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/bezomezopozixodebilaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=39+clues+the+black+circle+read+online+freePDF 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_off0000f87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87E 11148 bytes
SHA-256: 9151a0141e0d72c0a0f509f7e1be5475ae9cb66cb80c5f09c148c373cca0a2c7
font_01_sfnt_off0001127c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127C 17416 bytes
SHA-256: 021fa4dcf9e4d944034ef4d309b9eee9a75d11a45a5363b3fbdc37f91f4807ce
font_02_sfnt_off00013fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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