Malicious PDF — malware analysis report

Static analysis result for SHA-256 696db95a33fb18b8…

MALICIOUS

PDF

73.9 KB Created: 2021-09-06 08:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a9261ec39c6fe5efac7b3be844121a09 SHA-1: e979cd4078f03bd8563226fe4c61383ae72eb638 SHA-256: 696db95a33fb18b8b53baf8f5b8c05d4135e0111da152111db03bf135473a4a4
156 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 WordPress sites, a technique often used to obscure malicious destinations and evade detection. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links on compromised infrastructure strongly suggests malicious intent.

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://dewalt-naradi.cz/media/upload/editor/file/68530399966.pdf In PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/kapofiziveredalivoxix.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/dazigas.pdfIn PDF document text
    • https://pisangmanis.com/contents//files/99463861850.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/debovekexeg.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbb04d65c7---xiresef.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/vamavagigakumafameb.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/xenugemovasawapepojaba.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/75187000772.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c85064695---bunufusodupuzodazarufeg.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a04f6168570---67605507929.pdfIn PDF document text
    • https://menu2uplus.com/images/file/medimof.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/8d0247895a47494300f5bdf45f2598e8/guvodikozukaborapowekegu.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16076ebfa568c5---limetozarekisadimoxunuje.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/999b15821bb4b58ec11b33597851831c/jiduvoxapekot.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/eae93a56213da8ff1e4d46651becd3d5/kobava.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16123ab4be1d5c---67565201634.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/88971888422.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/10849656a0feeb8614304d483affb744/lowogexotakomawafobusiwi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/nl3fdguh2rlbe4ta35u35om146/firuwenefiru.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da2b7797e6e---xafowujuzisa.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f87c9bc0c---xepazu.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/53091579610.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/02b6433bbca2f4089b5c01f9756516f8/14118654594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=jurnal+tentang+pengertian+pendidikan+pdfPDF 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_off0000bf92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF92 16660 bytes
SHA-256: b92a1906643abfef30eef8d031f145e884ebb95a1ba5f5e211369b4ca78348fa
font_01_sfnt_off0000e9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 10568 bytes
SHA-256: df69036d46c03bba844a252637c67b8748f6734c8aa4b97cedeb44ff5ffe314b
font_02_sfnt_off000101ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1