Malicious PDF — malware analysis report

Static analysis result for SHA-256 187100ecde2f0149…

MALICIOUS

PDF

78.0 KB Created: 2021-07-29 18:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bc54bb5eb4f472f54bfee56e6de97693 SHA-1: 0e4430366b012de1900c50df8f77a55f96d673e1 SHA-256: 187100ecde2f014931f2d9f97cad3fe1fdfd5baf75ffa6ad8a26c5038abe01e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=trackmaster+5+in+1+instructions PDF link annotation
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71625026769.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0b50575e---gufedikorukokuxide.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070b7d5923bd---60218703523.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/jirokujopi.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b70eab610---7470726047.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4c821c818---45437015478.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210702_3b363.pdfIn PDF document text
    • http://bscartridge.com/pic/31432372746.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/46447925863.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/bijomuvovizenewupelifufiv.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160781d62626ab---75106031143.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/87848185648.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/59957885886.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/rj1d7gouo40i5amoslpr0h94gr/59868865291.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/rotuzukamarog.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/0dkdcoo4m9ef7adkf2f2p4dr32/rokiravezewikemi.pdfIn PDF document text
    • http://tfforming.ru/d/files/22898340290.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608752ec0e254---xipudena.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/vutipogol.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/tekapa.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/82153537627.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c081b3091---molejo.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/3kveucn3075ps7qj2ai8o9t3p6/badujipolozuzimasuvuxejom.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab11541e473---13350928749.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_off0000cd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD17 16828 bytes
SHA-256: fa473c65586336ee6cfb0583da54b64bd75f43f86ca0e3cd2048919d63c948a0
font_01_sfnt_off0000f8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001110c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110C 10684 bytes
SHA-256: 03f46d2567aa4db3347b9b20eebff5ee3eb4f49236f6440adc15487fda47684d

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