Malicious PDF — malware analysis report

Static analysis result for SHA-256 db817226dfd9764b…

MALICIOUS

PDF

102.1 KB Created: 2021-08-09 10:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bec36779838103329069d8d6fb2f96d4 SHA-1: 9f8af5b8bae086f7baa3a7f2f748d4f99fa032b8 SHA-256: db817226dfd9764b9e3e6a0d9ec2239a49f30d2a72506b03ba7e908f033f4b42
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as a lure to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://archism.ru/uplcv?utm_term=why+does+my+pen+keep+blinking+green PDF link annotation
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c3eb68b18---5037108957.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092de5f2cbc4---17202648008.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/072a1a83897e22e835c6b2d2bafc5027/34342633287.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fe5fe046cc1---3616666825.pdfIn PDF document text
    • http://metapolar.hu/tmp/pewudedajifufureked.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3541dea37897f08c34d436d38c0d09a5/sonowajoxadegipizererur.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d554e4dea---36394244967.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610aa0897fab0---dopejamalokafogome.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/3869915263.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/89276964656.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/91005475256.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074884ba90da---16099403000.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/zisal.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/5890517498.pdfIn PDF document text
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/90106831794.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/30305195306.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16272856168913.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/tizofupejunuwo.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/78e09bbc7e37b88e8f2293f6c3c4f154/99576700827.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/29911568173.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/63572126940.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/49245172806.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/85777707929.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/ronenifu.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e89ca61c---38537033512.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11997 10920 bytes
SHA-256: 6e3232b60c52551e2ebcccb8d48ef050a857b28757c76aa0a565a340726db6f4
font_01_sfnt_off00013228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3A 17472 bytes
SHA-256: 781b9f6fe4ec9d5aa01b0f1ce6b417e12197f06abbfd0fbf3f39be042075e9f3
font_03_sfnt_off00017802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17802 3972 bytes
SHA-256: 44731b8f40e9001c134802450b1ee21100e0ea2ccec1fe256096356345d5b24f

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