Malicious PDF — malware analysis report

Static analysis result for SHA-256 005a4e151a76ef33…

MALICIOUS

PDF

83.8 KB Created: 2021-06-10 06:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: babe5fbdb579bcb6e1641d4925cc77c5 SHA-1: b57448a04a21736ca91f77a2a2e7ff30c323c77f SHA-256: 005a4e151a76ef33eb1d24bc9829a955fe99997fd70a420c8b460fb64111d923
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to potentially compromised websites, many of which are hosted on disposable domains or utilize UTM parameters, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://synerhu.ru/uplcv?utm_term=technical+skills+in+resume+for+civil+engineer PDF link annotation
    • http://optikametuje.cz/userfiles/file/79371867827.pdfIn PDF document text
    • http://short-story.ru/upload/file/nonebereba.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/7redoek2cm1nc2cl2g4kcjjsn6/7658003725.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f2c22275a---badojef.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fff388530---94201997842.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/457c1467b4546948dde60ad1388e8167/vagoxigowoladigonovid.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7879bf562871e3428d6e43767409f86/zewimazajiratesebarabulan.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/kojop.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/i4i57b5iou7vd9e3p3gqtm9407/vegunediviwun.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/48570423260.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/suwibujitimesurisi.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/85299456748.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/n7vsumjbfoa6vscjclip9dqd12/jifuwosefofezoxasivobut.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/017978f379c20dbf594b56646631fa6a/wuzaxon.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1ee48cdaf---57286969989.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/a27613682367d6f9bf027087e910102b/1432019727.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b41f1c6253---51531195617.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021513535576852.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/2554dc5bd74a7c1a4690ba5122cf2915/zunepapurezesize.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10944 5368 bytes
SHA-256: b8055eff98427f1905924c78eb92786b5494e886fa66426356c4a8f6743d549f
font_01_sfnt_off00011b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B65 10872 bytes
SHA-256: 8cb1959c2bce7a5c0954937d6907470e3026cd30f31656eab8392245a759aaff