Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2cae097acf943c2…

MALICIOUS

PDF

90.6 KB Created: 2021-08-23 19:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4cba0029e878044cc4b5e0ede752caa6 SHA-1: e4dff696a61e6e8aa974858f0e327990cbd9510c SHA-256: c2cae097acf943c258ea1ab5339f2b397e7aa1c6bba02f7356ad0a9cf3713c86
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links pointing to potentially compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fipjp.com/userfiles/file/pibibiroroliratap.pdf In PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b9a0a308---vibidijob.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/dojukogunivofenif.pdfIn PDF document text
    • http://halaljones.com/uploads/files/25494421151.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/qr9l2aokqe4eg2vk1rh5fi81vk/gazukogixemumifo.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a748ff20b3f---tupamakunakimavoperami.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162310232161.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/fivedurobagik.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/lo43thr9qst6ml3cobhrfkca38/dulejigusumozipevu.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/merelojivaxirav.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086965b2a9ee---48700994907.pdfIn PDF document text
    • http://ruresept.ru/files/file/fapajaboniten.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b2a95a356---jiwafun.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/73635530586.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/mikebeboxegoximotuva.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/h8s43o27095ib8tbmrirq1r0h7/safitivusenosop.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/9p0hdn4uepjp2avbsa8st6uoop/39746674829.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/28847078391.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/fda87b7c2c7efb05d81dceefa088ccf2/83161659808.pdfIn PDF document text
    • http://dsagco.com/Upload/file/9395696510.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/4325090389.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d402e6183---fufinitimajelijin.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/1ca4aebfc8b9ffd2328f55593ac8b62f/wobogoxiwadudokutov.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/56a83siprgv1cm0meebqp3evhd/90392185408.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9f4668a0b---dagox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=manual+machine+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001181f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181F 10284 bytes
SHA-256: e8a2f144e1f0d485887044449775f483d40d5bcce8a4baad7bcdf52f3f16cd15
font_02_sfnt_off00012ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF3 17428 bytes
SHA-256: 3ce24ae0ff1a9ba16dcd5fe7d8b2e6a69a3f852785ae00b8f9d22600cd6fee6c

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