Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc30878d7bbf4dbe…

MALICIOUS

PDF

439.8 KB Created: 2021-05-18 08:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 55d4ab9592eff33ba4cee8c27e7044a1 SHA-1: 98befa255e9d007486ccfc96ca81140443a2b0e2 SHA-256: dc30878d7bbf4dbea5755080c718b200d91323c4c990a8fed9b473821f6c238b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs pointing to compromised WordPress sites suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9637

Heuristics 5

  • 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.
  • 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.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607226601fcfd---werobeve.pdf In PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e195eb6a83---gafuredakidudoxorem.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/t14p0dg540ueu4cdbk8ckoksvd/gowavitupos.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/5700e82f8d6b135d7707d06d0beb683e/sirosurujabime.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/57570588833.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/3993828095d57a59f62bc1f578b5555d/44153379431.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eba63734cf---12735396660.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16083cc1be9363---tiditevun.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a246828d315---40304174729.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/wulumefikosaviravedoki.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/2cd10cbc1793855f9080d57a92e4f132/zelikotafiwomusuvosi.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/svmuvlr9hfuujdnkqqs2cmmb55/50005639684.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/92227f43270f0207bd5dfffe27d6be52/nizeropokabazisoj.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/67228971767.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ea8fba9e4---55539751584.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/62d91cnbp9jj2n041gqok46rp5/riwimifetasewetepare.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072859825569---rokotarenuwurexugosar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=chapter+1+lesson+1+context+clues+and+acronyms+answersPDF 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://scripts.sil.org/OFLIn 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_off00067520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67520 5532 bytes
SHA-256: 76f2450652fc639f0695017bb634072a2e8581b91806c311bf16ae098a5b508c
font_01_sfnt_off000687db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x687DB 14312 bytes
SHA-256: ec7882c4a6dc32bedc186d1f4d8da9a5ced718b61ec2b542ed855a299d0b2a4c
font_02_sfnt_off0006b69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B69A 16592 bytes
SHA-256: bf192914137028cc5278dc0b79a6dbf429e5243d1a70401c26d120fa9d863c87