Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b11fe84baafbff…

MALICIOUS

PDF

79.1 KB Created: 2021-08-22 06:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c35eb158be1044875a3e6f9e115bb5de SHA-1: 30992f18c146575a77e6d0eeeeec35c07535410b SHA-256: 90b11fe84baafbffc9be0090322121c051b04ca43133097a7ca556980e0bb6ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • 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 https://allytemp.ru/uplcv?utm_term=what+kind+of+oil+does+a+2006+yamaha+raptor+350+take PDF link annotation
    • http://andrelandberg.com/userfiles/file/wanodupexupowokebagi.pdfIn PDF document text
    • https://artbynela.com/uploads/file/50098532645.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/mlkfkncjmicqmp45k5im8c5ut0/86867114122.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb497461df3---pimuvuletarelubuzasu.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b73838b3c4b---49780119323.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/18375290324.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075c2a63db58---gilugisebaxidin.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/45853315484.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/milexapogumoda.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/9kdu55hhakghs4rangqb47bblq/gosotedigazesi.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/nexusojiripigidofejo.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/13884036626.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d6f6336a2---moripulemitaru.pdfIn PDF document text
    • http://myesen.life/userfiles/file/fusokedizoruka.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/2ce137dda290a43cc699f987f7c2616b/17821298187.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/61bqv6saaju2hht9r2rcb7a34u/27524824053.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/zabopagadom.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/20750636579.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/7ed4la2amf6s8a0jfo1a8v4m1m/62281429448.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/14696039141.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6f485f87f---xurukatenowopelabutamef.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c206d4a10f7---59503734936.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2e0edc39e---fikadakule.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_off0000d0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FE 11680 bytes
SHA-256: 597bca9053e6a33aed71d80c5093cf10af6e53bca8bebfb2c89cafa4017655bf
font_02_sfnt_off000104af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AF 16308 bytes
SHA-256: a23f51290946f3053d5eb4cf5761f2ad8eec8ccbc279aceebcb1c20517bb3cd5

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