Malicious PDF — malware analysis report

Static analysis result for SHA-256 b968b2bcc8f0ff8f…

MALICIOUS

PDF

69.5 KB Created: 2021-09-29 02:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e88f6474a96c47637d37be5f0855394 SHA-1: 7ebc3d111e25463e52cabc3ac979fef9806e52dd SHA-256: b968b2bcc8f0ff8f33251673b7a5fe785b44f6b2578ce74225e880d39d31d286
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the URLs and the PDF structure point towards a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://assofmt.org/ckfinder/userfiles/files/20939515723.pdf
    • https://ventadeterrenosagricolas.com/userfiles/file/bidibegolejevesibagu.pdf
    • http://tcsm62.org/uploads/news/file/64726765781.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614574fc9c2ce---kezazanemuzasesulavidoj.pdf
    • http://halmar.info/userfiles/file/96136632535.pdf
    • https://777mto.com/contents/files/jewadegudanuwujiv.pdf
    • http://nexxosrealty.com/userfiles/files/vijirekikipixiligorig.pdf
    • http://redondoclassicburger.com/uploads/files/35386869889.pdf
    • http://jinyezi.cn/upload/nuwurodamuzoxijozesikin.pdf
    • http://ylpcl.com/ckfinder/userfiles/files/tukiluxiz.pdf
    • https://vargyasnekonyveles.hu/kepek/other/file/lupazosumopemol.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/qmsh12i50mrfd598knnfa809ca/90460183756.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144903506b4a---fegedaxobakevin.pdf
    • http://pickup-ws.com/userfiles/files/bujovonizefisigolatejo.pdf
    • http://motivationandmomentum.net/ci/userfiles/files/95907816190.pdf
    • https://tavcam.com/upload/ckfinder/files/1755085033.pdf
    • http://wanyuantemple.tw/userfiles/file/mejizidexabatow.pdf
    • http://freeware-software-download.de/uploads/editor/file/tigesa.pdf
    • http://gemwishrs.com/ckfinder/stones/files/gajipuboruwinakuzamibo.pdf
    • https://ceylanotel.com/firma/files/poxizidiselutizuniwepi.pdf
    • http://kbfrutos.sk/images/_file/zezifufewawufidila.pdf
    • http://aliguoriarchitetto.eu/userfiles/files/10451677133.pdf
    • http://gps-tw.com/CKEdit/upload/files/xekutelediwutewejijoxop.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149484e9fe07---51956506220.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ppsspp+gold+2019
    • 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_off0000afc6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC6 16792 bytes
font_01_sfnt_off0000c7d8.bin
7770b89c72b63108a9ef8b715984d6520d7af45fb9261bc601e50f2b27b3c511
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D8 16444 bytes
font_02_sfnt_off0000f1b8.bin
57851ff01be09c2bee54d83cf8b7292aff82eeb5a770b467a2d227b650cab781
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B8 10340 bytes