Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72c8a465a6b7235…

MALICIOUS

PDF

84.3 KB Created: 2021-06-28 01:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a058aefc9b3f178840974912ddecfb77 SHA-1: 3388fab37af3d3dde147f2977aa9e7d98dfedf2f SHA-256: a72c8a465a6b7235049bf364f8a63dc73e6d89c31c4ea4adca70c22f3db90e94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress installations and disposable hosting, suggesting an attempt to manipulate search engine rankings or redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution vector.

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://catamma.ru/uplcv?utm_term=writing+an+organizational+strategic+plan+is+an+example+of+the PDF link annotation
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00beb08378---82848597273.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/pubudaxiko.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/m2k33shdnjg3mlvnefdc3tqfse/88600160231.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/14162372092.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608746602e495---98618355591.pdfIn PDF document text
    • http://aplus.to/userfiles/file/rarogozisakobabe.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/845cf7600152e90ab6e2e4b2432a83f7/juxofoxi.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/d832a2c3798e731f6fedcc3020fa2ed5/36228932331.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7be1447ce3---wajanol.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/nigubeme.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/bozotugozokoxok.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdbc4d5bd7---73225883008.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609528722beda---zuxasobetojuromovizepunu.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/jejigusowax.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4344ceddb---6167578102.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/30461357282.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/wunigev.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/ganagelibogebusugagiviril.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/j916rm6qg975fqimvgtbep959q/82255783661.pdfIn PDF document text
    • http://alkanboya.com/files/file///vonuluvutijabedesofopalo.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea3e3b9c69---kabojajijupovomakuzimit.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/61929678676.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/1039092832.pdfIn PDF document text
    • http://kleiberit.ru/files/file/detituzisajopirusej.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fe984cbe6---kurojevujetitadivataj.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_off0000e5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A7 16948 bytes
SHA-256: c5b7091ce235e4ddcc43ef2a5260927c591ca4f5fb5f07307e4c71aedd139f86
font_01_sfnt_off0001119a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B1 11084 bytes
SHA-256: e0a47f1854a4f8043294dadd206284c60277a6484d2affd8902435caa214423f

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