Malicious PDF — malware analysis report

Static analysis result for SHA-256 679b493c0dfffdbc…

MALICIOUS

PDF

97.6 KB Created: 2021-07-17 00:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 948a3961d8fc12cea3f648bb7c58412c SHA-1: b77b394611da67a68bbe6d90704fb2dfdd0042a4 SHA-256: 679b493c0dfffdbc5f37f808acf8aab2d0ce4d367066a2ce759bbd7b629c1bbe
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs indicates a broad distribution effort, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a63fa0ecd3d---tonitugufigonorawifujatix.pdf In PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/adedb4522f5efd2df9f62e32a6b0f38f/62001567368.pdfIn PDF document text
    • https://arerp.kr/data/file///gajotad.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/8e9o857tjuidf1qrvc7l2gqhtq/25816655482.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/b389c901743387a1f51c8a1f173944a3/9593613993.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/38917865027.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/xerenuwolezeka.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021051816081172.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/pujavo.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/94518267699.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608310b0d70ae---7114205291.pdfIn PDF document text
    • https://successalpha.team/upload/files/wabuwodidopovo.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/d75a751925390646e57ae9cbb13ed7cc/ledaririnudux.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/8252205725.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099448601228---88257439617.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608311d717b89---vexadesik.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c4c69e195---lekenexegijorokafido.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a133e91ecd7---lobabiw.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/6f9d7cdac327d590a8b17b73e1ab2920/52501207219.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ed4fe06f8339c50dd54eaf71bcfd1df2/85729416885.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d402ea2345---satowegozapakadopubepoge.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/72457379900.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/27153131510.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a8efb2530---visunoxojireforepenul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=promethazine+for+coughPDF 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_off00011bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000133d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D2 17272 bytes
SHA-256: 5bd0e374b14e599df2dea6d36a102694f988889edd099bc00d68fe4a657afd67
font_02_sfnt_off000160ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160EA 10728 bytes
SHA-256: e9fa6eebb09b99442dea0422ec8813058bff4d593c0420443572464abebd2c26