Malicious PDF — malware analysis report

Static analysis result for SHA-256 b116167bb7b38237…

MALICIOUS

PDF

73.7 KB Created: 2021-09-26 23:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82d946c262f16f85fcaaf45f7812fcbc SHA-1: d985a41bb5546eeb0c046b0c33188eebee3959e6 SHA-256: b116167bb7b3823766bce778f497973edbdc2b4b094efccc7ca9c4fe48f87627
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious files or redirect users to phishing sites. The presence of numerous unknown URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613188521c3f8---rusiwipuba.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1fde304fd---50234951189.pdf
    • http://restaurant-lyons.fr/userfiles/file/wejexifutukeduxarebujaf.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/19eram22tl3e6lrjjdbhe43r4a/fopuxujatewug.pdf
    • http://worshipedia.mobi/sites/default/files/file/9479696882.pdf
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/vovenadudikipabifexuwetu.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614a05d5e86a7---9852121880.pdf
    • https://noithathoaphat11.com/upload/files/ferubakojupenefuv.pdf
    • http://b-solutions.net/userfiles/file/nefuzaferumevo.pdf
    • https://baptistfriends.org/media/zodagamujudamopiduk.pdf
    • https://parkettworld.com/upload/files/kudejumig.pdf
    • http://kammerchor-lindau.com/file/libupisise.pdf
    • http://nbc.ua/design/pic/file/16056140117.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/f1ffc97129a5ccf3ce87f865ff36f3a9/napowexupojix.pdf
    • https://marlschuz.com/userfiles/files/74360181567.pdf
    • http://infrabud.eu/fckpliki/file/siwibabolaxunevidufi.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c79056fc24---rikoz.pdf
    • https://tekstilkentrehber.com/upload/ckfinder/files/37179726095.pdf
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/wajalu.pdf
    • http://ukrainski-rosyjski.pl/userfiles/file/nuxivozisogirimatamaguzi.pdf
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/13009290821.pdf
    • http://cec-intl.ru/app/webroot/files/file/63218848097.pdf
    • http://billsky.ee/files/file/22721325741.pdf
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/guxit.pdf
    • https://mimpidia2.com/contents/files/93449485807.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=moy+restaurant+game
    • 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_off0000bc7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7B 16792 bytes
font_01_sfnt_off0000d492.bin
de0197f47c3d2d209e7f0f6f428af074073d8bb9cc1485f3bde83f36ecc4d182
pdf-font-stream PDF embedded font (sfnt) at offset 0xD492 10520 bytes
font_02_sfnt_off0000ec9b.bin
8fdbe5002e63f2c9a7e1ee0e59b8ad737fc11e0c51909669fba96ce49a8233ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 17460 bytes