Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba18288a9730255…

MALICIOUS

PDF

87.1 KB Created: 2021-06-26 19:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f2055282631c840a1d58d38e89105b2 SHA-1: 143873b6e43dedee449377ca905b846c2acb21d2 SHA-256: bba18288a97302558b51c9465cb2d65e64a0878cb240c4b2b86fb5a60ae65ae0
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised WordPress upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure as a link farm suggests it is designed to redirect users to malicious content, potentially exploiting vulnerabilities or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=globalprotect+free+download+for+windows+10 PDF link annotation
    • http://rentaruedas.com/files/others/44061475060.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/duzijasoza.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/9955524946.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/kenewaxu.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/092154b013d81f9874658d027b7fb686/41886099284.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/48828171372.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/05480612d5fa48bf6c2a21c6b6bbec17/67448733011.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714d967fffa---3636954158.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/9ecgeie36pumgj3nc0sv3gqj80/41861209668.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/jesapomumogukufen.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/527dbcf19ddfaf46cf28d2b9619e3663/54112710541.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/disejodetu.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/66ui61fr44piqj64tv2burude3/reremobigit.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9195a041e---34766199675.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607affc0047cb---kaxedasosalo.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/10606264169.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/3a4b74846ac62b77f33046a029d8e8ca/lusorizebezunux.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/73416846670.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-18/20210618175021358629.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/85024138961.pdfIn PDF document text
    • http://gyobel.it/public/file/187233626.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b73e35768e8---32661047988.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/8860565bed21cbaed9531982902cfd80/64085563000.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/3mu0tq6b21le9gvq57rgk4f1dq/nozegovarurelun.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7790de4ef---kaletibeluburum.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_off0000f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2B 11052 bytes
SHA-256: 9cb3e322a213e33905c7cf09003c79e6a8e0a6b9339d5f942a8ead74986f2c70
font_02_sfnt_off000123e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E9 16588 bytes
SHA-256: a95d101560c72cb0da187d5a2ceddc7f4f149094180734c9a9f2782ed63c3020

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