Malicious PDF — malware analysis report

Static analysis result for SHA-256 662bd9af0c9c55aa…

MALICIOUS

PDF

87.4 KB Created: 2021-07-01 17:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cfee0d552d7acd457ebafa595c22412 SHA-1: 1724de3179af2d29c38a8297bd242234e2e3c769 SHA-256: 662bd9af0c9c55aabded9534f697eba5bc3713dc8482dfacf9f7d30edf8fdff1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://12tiga.com/contents//files/fibizafopux.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab193585602---simefagam.pdf
    • https://ddshower.com/ckfinder/userfiles/files/97209967576.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2b150f33c---bubefozuvoromotov.pdf
    • http://maekalocal.com/Maeka/UserFiles/File/72133273596.pdf
    • http://beijingxinzhi.com/userfiles/file/20210507140724_1078468819.pdf
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/veneses.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099d0263da36---25758047435.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/563cb8fb85870fee5d42bedc391f209b/lovezevagepusobamefawabab.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2c2ae7f756a9570b521196f4992a05ec/61278627190.pdf
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/jowevajuso.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dom73fpqbekhsbkonjm8pgv29l/23703239646.pdf
    • https://eternalbliss.net/file/rikiribenitomajed.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c0361dd12a7---pasetilubeta.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/7577f7755f773533108abc7e97166d8e/39670218293.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/9ivdrdvpt1hkjfqik8ekog1d1m/pupoxaga.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160718267b5357---bulokanonakuxesulovodu.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/e3c00cc0474b03fb99658e0d18f5ff4d/jutabuzereroxukoriwuxuwa.pdf
    • http://cafesezony.ru/fck_editor_files/files/57501799617.pdf
    • https://noblacklist.pro/web/img/podborky/files/bawamamadepavunifopalo.pdf
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/6843697583.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=chrissy+teigen+mac+and+cheese
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f13f.bin
a95782bfa33f5d6f6fd8aeabef4c1948c8ac156ee8f2c4c83aea4f847c0de4fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 17948 bytes
font_01_sfnt_off00012004.bin
4f2173ff13bf4b9efe97d785f88c933e92346d5c2508faba7e2df5fa06fcdd61
pdf-font-stream PDF embedded font (sfnt) at offset 0x12004 10796 bytes
font_02_sfnt_off0001388f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1388F 16792 bytes