Malicious PDF — malware analysis report

Static analysis result for SHA-256 3790fac963058aab…

MALICIOUS

PDF

78.0 KB Created: 2021-06-29 04:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 121148f71467184000e2f7cbf98fd9d7 SHA-1: 519c179317d39a1947895a69744eb90c704b97e5 SHA-256: 3790fac963058aabd7df1b25d5787a727ff28d4e2b11e780b011cdc1217c8a41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL distribution are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://drafthe.ru/uplcv?utm_term=find+the+lcm+of+40+36+and+126+by+prime+factorization+method PDF link annotation
    • http://www.empresshasnoclothes.com/siteuploads/editorimg/file/37469185849.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073e7d5583bd---mirevunufapokewam.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa7041a889---88042484927.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d7b69740c---filaja.pdfIn PDF document text
    • http://fairmonteast1978.com/clients/71195/File/49282849366.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/93687662880.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/4920358401.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/sefiwameledexaferukuzev.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/cnfigsfqhstrfimlg0th68pn2e/sizigukorejalaxoloz.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/150968831.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/10788938073.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609156439c76c---5144302623.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b7541e4f83a---zekufaguxanafatofutiz.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/91c3e12faaf92ff0e47998669fb6073e/98407841036.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/zesajefedafonira.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/6ce1a4c12dfbff7bf32484e9214f2b29/62568916908.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d0c3d69cc82b323638da7ddcf951b767/74605927970.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/vitekevirizesukim.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/55351395963.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/616a9dd19809e5ad68afa47207ea2422/41997280016.pdfIn PDF document text
    • https://pasarantogelsatu.com/contents//files/51056824638.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/28cee57756b3d689ad3d4080e570bcff/43764895589.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210529_060849.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcf84f1d5d---90281475020.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/df11fcde594d4e4d276fef40e5b551ec/35115148227.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_off0000c9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C0 16920 bytes
SHA-256: 72a1ab34dedf4fce15afcc0cf4e5eeb8dc39ba649cd3995a132a5088dc8dd406
font_01_sfnt_off0000f630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E47 11720 bytes
SHA-256: a75ceef65f395145866bb05ecd01570f09e9f1083ac1fdbe620c5bad0de0e1e9

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