Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8512af556a26cb…

MALICIOUS

PDF

139.5 KB Created: 2021-07-02 10:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d603acf6d0069be888d70e50060ce1c1 SHA-1: ac63a15a2621b7f85b9371d02d1b6694e2abc559 SHA-256: ba8512af556a26cb8586b820fc69ade929a8381e9de565f0cc8c3cfbfb7b0513
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting it functions as a link farm for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the use of compromised infrastructure to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608408753931f---86486965236.pdf In PDF document text
    • https://rzfmuhasebe.com/userfiles/file/fiwujewugebel.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608416a0c20ca---1062782430.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/1gf87ub2ca1l8bi3k28q2t2eug/57299222256.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/oju5fve918pabui8srr12o2967/zobilogovu.pdfIn PDF document text
    • https://ekransamara.ru/files/sakudekelodinagotazope.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/tjag8t7fibr21sb7osltfvjp48/44891019398.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/buxokidowosele.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/e231969d468b7e96799cb4443340c78b/burevaziligizoveraj.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a960757358c---59742527701.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607802515b9a3---18267167051.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/31537091085.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/10b2469ac29d647c7186b979a3e76ed3/43078580638.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/80841058074.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/749066b3c8ccfaa7678b6a11b98cd868/81034588988.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/lafatetepexefawef.pdfIn PDF document text
    • http://goref.ru/files/file/wulodivegewogat.pdfIn PDF document text
    • http://guowangcable.com/d/files/rujavexuxito.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/o9olfoi3i84dn77cu7ugd2utf3/sapezi.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbc4c15a9c---95090659977.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/20098470284.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609442adc8df0---piwisevovujebot.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddfc9144176---vigepepawasagagikojod.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745cd1eb10e---vivijobowukivobow.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/fbe882a2f8eb53480d7e57bccba79758/simeguvamuvumivobogapuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=middle+school+rules+and+expectationsPDF link annotation
    • https://mediaget.com/userfiles/files/jiralojo.pdfIn PDF document text
    • 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_off0001c02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C02B 17880 bytes
SHA-256: 0739bd7c1df4495efb9a049539fa494e758f30b86fbe2563048368872d96f985
font_01_sfnt_off0001ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF09 10808 bytes
SHA-256: 1c616065ad3aeb3363ba885a0aeb76fecb69c4ae946dac6f300ce69f573a1eb0
font_02_sfnt_off000207e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x207E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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