Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b12145a54afa7c6…

MALICIOUS

PDF

82.5 KB Created: 2021-07-13 18:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 07774fed332725595a053bbf264f0f14 SHA-1: f199cf719847aee528ebb09c13a372b14049efd9 SHA-256: 0b12145a54afa7c618841ee408746b97afbe42e50d800952767d36905d1f63d6
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malicious content. No scripts were extracted, but the structure suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/71loer0u00ir5ip4t7a8dmnf92/merorowurusizokolijuj.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/d9nv6rnun53pnkm971e1r9b241/95982276086.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210712_2051F64803AE9195.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fe6b67110---95720230042.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/98444039350.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/b9f9b5d20a974fd45d2f7c27584c6f0c/xeturanixonakirinazuroju.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/36422277055.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/55617532193.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/82545838170.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/e5crqb1b4fu1rrsbeph78oghu7/vapiwaronazesumajebanorod.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/da8ff77cf71b8e81269eb937e02888a4/12690446246.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/nosufujum.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/84867040406.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/3680190176.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/kukabi.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/crunaniaruj3nrt4kimg4qh1m1/62119443662.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/17091403732.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ec813b8670508003fc21e9d3cf862eda/gefaja.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a3c012b5c7f549f68b04e6019a68c123/88388944289.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/bametirasewev.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/milanelenikuwopaduk.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4c7c18378123ca45a8cd3abdd66b546a/89910265668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=for+the+one+you+love+lyricsPDF link annotation
    • 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_off0000dfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE2 17340 bytes
SHA-256: 8da9616dbb884d91f34d08d827256b69344c06e8e1f64994d2b0bf2da2cbc9f1
font_01_sfnt_off00010d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D47 10424 bytes
SHA-256: d90489826f4e9db5e4a9f7956664bedf37ac35bf958d2bb700d617e6b88a20fb
font_02_sfnt_off000124de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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