Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca99501e2a4f35f…

MALICIOUS

PDF

123.1 KB Created: 2021-07-06 15:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4ba0084574387cbb876a6d3ee180612d SHA-1: f0f7f107150cd979d64d426727f4652225abc4fb SHA-256: 4ca99501e2a4f35f584fba034b2c42738e74f2fd89b69350df3e6fd24fd15c14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the primary evidence comes from the URL heuristics and AV detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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://sunnyvale.com/wysiwygfiles/file/xijel.pdf In PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/1386313681ee46f28f5d22df1ebb3ead/lajater.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/ninebe.pdfIn PDF document text
    • https://aashianarealty.com/file/lizorugazawutopime.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c70abef23---jafatot.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/mezar.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b348b5d35e---56351607621.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/958daf289dc849e04b167592e59a4849/22489347130.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/mupeturekazuwasezuzudoxof.pdfIn PDF document text
    • http://aven.su/userfiles/file/63761668700.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210605205011.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/t126p1ftltnak7a46kt51jcgt7/figubaw.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/51f0dada770cea450dafea43781e4b22/nisajab.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/34943342112.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608166f3a7e9d---79479903695.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4f6c1a80a---pivasobitezafip.pdfIn PDF document text
    • https://sinarwaja.com/account/files/gasulijitupanego.pdfIn PDF document text
    • https://maturana.cl/upload/file/20245492815.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/32654565334.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16073fd02151cb---rexopanivixexepezabito.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087050c61512---dowasonutivet.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/t1knth313v43p4o214thdl4poh/29886959590.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/9807974beae53a642d6f953773156fed/17275053329.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a6767e232a7---niwunerimeran.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f86242bdc1---90478556035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=transparency+international+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00018ff7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18FF7 29664 bytes
SHA-256: b639689696262899ba7d805f3b45ec65f4cc53a9c56764ecc89366c753116991
font_00_sfnt_off00013d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D05 19568 bytes
SHA-256: 3dddddec2477c77bb7982a806d254d19106f884ba04fd9f1ab3e250e8a937d04
font_01_sfnt_off00016f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F8B 1760 bytes
SHA-256: 478d64aad58a46c60a63c2bd6d05d9c39068b35528f549688063ac651822ff24
font_02_sfnt_off000177e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001c510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C510 10792 bytes
SHA-256: 7f6b15f864a23ba63686da8666668689521a07b9de078f3d2ec07b302fca512a

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