Malicious PDF — malware analysis report

Static analysis result for SHA-256 f705e3ad0e721d9c…

MALICIOUS

PDF

80.5 KB Created: 2021-07-03 11:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bcb7337ef7f7ca9b9f0df46be0028eca SHA-1: 3fdcfcbb3bd35eef6bf42b454188629f0a1c7c5b SHA-256: f705e3ad0e721d9c152ac30056cffdfe7b9403092d8bc4c5e8bbb9e750785670
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users. The primary attack pattern involves leveraging these malicious links, likely for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a599ec142a5---wominafi.pdf In PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/budadopitowepe.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/42809207968.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/tqcqt3cg25e7d2ns3cmgtul4to/65259956773.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf2b5cb80b---52111604796.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/10829285702.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/latitumol.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/3003979096.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ojr4oaa9tcoe1dv48j7s5gs7n2/75569634029.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/zejikora.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a55daf229---kugate.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/ruvafejeko.pdfIn PDF document text
    • https://songhong.info/userfiles/file/tumalurovitufukimakofuzal.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609494a1c93c5---tunopizidamofenutod.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086832a268a2---44356925477.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/nisnqlfrutkbf8qj3qu1k8bgnf/69631240603.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/a0655a169096df77c08648e2861f4de2/52843584111.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/93302095856.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779f0b39ad3---vovevenejirosoroju.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/0c32pbud1k405cs5sivdug9ud9/nedowolanevi.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160910e7f7d1f1---70128150506.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/4bff41b56cd72ef26943494236025b10/59194782782.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/88962924999.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/a77f9c0e7f8f7080a9be2b1dc31d2cf8/13666862145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=nh4oh+weak+or+strongPDF 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_off0000d7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F5 10480 bytes
SHA-256: 824b3af1c31552cdbef747ae273f249d29e4de1b6baf4f29e2644251c7780c70
font_01_sfnt_off0000efe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 17248 bytes
SHA-256: 853d83a5fc4a746fa6300bccdd2265ad83774c9c064f9995dba338990bd3dbd8
font_02_sfnt_off00011cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1