Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c873f1a957df0d…

MALICIOUS

PDF

87.1 KB Created: 2021-07-05 01:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e23b541601d72f2645959521c5fd735f SHA-1: c0227b27cbe5b492179aa075ac1982aca170a702 SHA-256: 11c873f1a957df0dece802afbcd18dfc73e30c1722ea4a1f967d0cb981a39caa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It functions as a link farm, directing users to various websites, some of which are hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://catamma.ru/uplcv?utm_term=someone+like+you+i+wish+nothing+but+the+best+for+you PDF link annotation
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/66c6583d98ff5f351c6c9d58d56e2184/zarofuligujatu.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/duzisazeresewuxuvu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/913bc4c8a200dbc65d4b0858562808f1/folizubifawajun.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/42fd2d0bc20969a034315705ac34ea68/66951313543.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/47552347864.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/lovosim.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/mebosumajedun.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e229173890b---61933534134.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160714d8a09b56---14499973425.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160702fec6078c---vovusafilis.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16098113e05802---78786846293.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/f15587cc5be4f43f054782c204e3fd7f/rosuperenigifepaf.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/pokiperulojexisuripaxemu.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/7b610dbdf51c2f0702b84d973b52d17a/82571699299.pdfIn PDF document text
    • http://zae.me/datafiles/file/10172418936.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/dp9r7pcvamj7ntufdsbcusjmsj/lagadakuvigilekutivataja.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/80859207160.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/36865294500.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ks8npr92r1o41ktgdike3e3mu8/57437711459.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833ce46134b---94883618663.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/7645c2177d46059c87d20f65652f5a16/12606128124.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_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 17268 bytes
SHA-256: 43963b291f19b074b3347c2fbbbe0c1031d6397b4d8f1e3612e07dd24035dd6c
font_01_sfnt_off00011b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B13 11108 bytes
SHA-256: 6621d3dc5f815372e720b5d7346ca57a4eb7f1a003f336a559ab6d091f2a5564
font_02_sfnt_off000134d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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