Malicious PDF — malware analysis report

Static analysis result for SHA-256 050a9fdb123ffae7…

MALICIOUS

PDF

130.3 KB Created: 2021-06-29 02:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a3b8a7dc7210c765fc12fb731a216511 SHA-1: 43ce5744373a1ff9586af877678946d5b38d89b2 SHA-256: 050a9fdb123ffae744cff060e978228532ebac08a7ea8a959cd0da5a49550891
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16071a98c7f374---nonubitobetavilaxibaxe.pdf In PDF document text
    • http://stardentalcare.org/userfiles/file/tixiwosikonelisat.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/e3517222fd9a8ceed4d6d5af582bf2f4/24079847498.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/71291018105.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56d1817d95---bonokirawezuv.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836ddb01957---47677168895.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d040ef4038---bexiluloxazofeluwapebis.pdfIn PDF document text
    • https://dacsanmyhuongbeti.com/app/webroot/files/images/pages/files/91935289720.pdfIn PDF document text
    • https://unitjaya.com/contents//files/supowovipuwib.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a93e6759bb7---dolaripuweritog.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/61292884987.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/jivilewurasaveror.pdfIn PDF document text
    • http://haai.org/upload/file/lutugitewasinijelisabal.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/mkc5ue29fqttvrvqaurlupnt4t/32932750564.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65846dcbc4---nopigobe.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/94168076049.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c68a3c842---49153269447.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/m8sur4bab7f902tk5cuma44fc7/wuxekafolozezaj.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af2b7e8d0c---pasogavavuzisud.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a2b15de98---jodadujifa.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b35e485af9dbd77acf255c87925c8d6e/gumidirodatome.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210629_062616.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd912429032---zaxobuvo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/3a198fd19f984b1b90ee9c6668588a0d/fukud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=curved+suction+curettePDF 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_off00019eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EB3 17308 bytes
SHA-256: c616a55be474f4a7ae8bf9893f78efa55143b1d0f7c484203e8860f20634bc44
font_01_sfnt_off0001cc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E41F 10352 bytes
SHA-256: 535be3b250dda463eb2657d1369aeed0262f74a9e15a0de657cbc101b3c93cbf

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