Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5f4694810c897a…

MALICIOUS

PDF

84.3 KB Created: 2021-08-15 05:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c46df0912ff0d87b69bfbec3897f2b4c SHA-1: b31c3f59b607347583ca9b7013c5b066eb344d6b SHA-256: 8f5f4694810c897a021cd0e46567c0cbfc845ac46658da6b9f9b5427778b6690
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely serve to distribute further malware or host phishing content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763207ef9a1---48869287035.pdf In PDF document text
    • https://yukkumpulgroup1.com/contents//files/24901757946.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/dc8550c04ba43084f39c59a912d7769d/44370959726.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/52999510060.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/mafijokaz.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/pogazedebajakesufuvege.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/fdbaf0997cdb0ade0d9018ed156af2fb/96722529664.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/20777702800.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/97916362415.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc2e7e0b5d---nujogozizuwirenaxokebos.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607829918826f---59195918890.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/varezukemavisanob.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/58833936079.pdfIn PDF document text
    • http://charontrade.hu/data/file/88742693113.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/sasajazubaxidapaxelefuxe.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/6154917989.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886f03e0cc9---45053720132.pdfIn PDF document text
    • http://drive4smilesquebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/tokibunejitimo.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/95121653171.pdfIn PDF document text
    • https://tsegypt.com/file/dixovomeratejinavu.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/topewobijumegowagojoxeju.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071c9f9d770c---63317042245.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/71666189531.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/7e29c2799a69a393a0123f75475acdbf/lewobotinofalu.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16078b66803457---12032587322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=blaupunkt+radio+mit+cd+playerPDF 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_off0000e0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 19144 bytes
SHA-256: b09f80c3267f3c7faea0263addf381e3fe4c43816884beadf042aa6da6f002b8
font_01_sfnt_off00011265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7C 10868 bytes
SHA-256: 1c7e0e94a399a6d7295f61dae34008f03d75ad5cb09391a177ba1c3a42ce8954