Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5c31a2e589e873…

MALICIOUS

PDF

79.8 KB Created: 2021-07-05 11:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 38b7213885e033d14783f48a6ff005d6 SHA-1: 3c4c41ca21ad5d2d88899d78b50a152a050899da SHA-256: 5b5c31a2e589e87339d7ebaafd9fd5a754ca3bfa74e0c5c7a308578d3403c951
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution, aligning with the Spearphishing Attachment and Malicious Link MITRE ATT&CK techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://bowlingkillers.com/imgdb/files/73026454352.pdf In PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/9305772ba2e7818aa6c6d3b407f6e302/95670676544.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609db70cb4de4---77275724657.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/63890240020.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/b5lmth11tf5jk3sogh6tic5nq8/returimibuduk.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/81a31617123eed7379e7949515b51e7d/vowezefurujilafowupajozox.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/jeluxijosunogizozopureb.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/0f82c5f73bb3269197196017330b1ee4/61212461576.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/jojalapijofuwinozaxika.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/vojimokimesuziwakulu.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/46762657867.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b9e507f3a74---voraluxamabisa.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16082b16906408---tofekozuxadekejitat.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fe7653071---buxafejofenamanubazu.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/38625928880.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd711c4f13---84430611511.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/00c68e664451f92f28c6048fc06173d4/60859362912.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a8445f688a7265185acdf512138feb3/rekamexisafukusirofewixi.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/sd195l09e3uo1bsf51fs2dgvj6/81084206196.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb742f18c47---32515074051.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b06ce99927---81527409062.pdfIn PDF document text
    • http://salkim.com/userfiles/file/tanifimaxifan.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/lixakolusibediluligewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=i+will+always+love+you+johnsonPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE24 16684 bytes
SHA-256: 2fcaae505fe2231264a5587ee0ce1eb2c7b4909ead260dcfb5a071e804034d7b
font_01_sfnt_off0000d4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EE 10456 bytes
SHA-256: c09d2874556c79b7231ea5bf04a77a8b0c908eb23dddb39f9f320689960594b7
font_02_sfnt_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000104a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A8 17328 bytes
SHA-256: feb4e1480ac766020d1351b651d14df001c1d7585cf0b9fe37308e67d6f7fce5

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