Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b04a75cb0e916c…

MALICIOUS

PDF

70.7 KB Created: 2021-09-24 21:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b3958a4a0b8ed03b439c9bc15595d733 SHA-1: 8a39f7762b602d0cb79342829a853bb3c9646789 SHA-256: b6b04a75cb0e916ceb52d035e77618077896cc8d49bf61252e849d0693fe50cb
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of the file, suggesting it is used to deliver a trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://sonerofset.com/userfiles/file/zakoripewa.pdf In PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/45035538426.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/xizakesimagabon.pdfIn PDF document text
    • https://citronel.com/userfiles/files/61312893779.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d882fbf897---vivozazemadewuzinebopuni.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/57573241392.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/kodotolit.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/59508249218.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/746f1df855be87c822f0e2cfda6b8c33/xuxaguzud.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/23544486723.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210903005259_j2ibm8.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/nefatexovajutibebanuw.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16148a65e11788---fejukifijuka.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/54100113274.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/69960872666.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/578stqf6lkk5en5ke92u29lg32/nuriwejitujagevipawewuzi.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/34615273827.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202193131884829.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/6938040339.pdfIn PDF document text
    • http://proxima-online.it/public/file/laxaval.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/83862608379.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/37600277361.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/jifevorotulibulupawe.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140abe99d01f---64800802689.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/53561600935.pdfIn PDF document text
    • https://duvanco.be/docs/files/lugunetenowagavonima.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/ziforumoxizasesogirisawev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=dragon+ball+extreme+ppsspp+downloadPDF 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_off0000b399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB0 10972 bytes
SHA-256: eb930131d694d30017d726680d4c09769da212d9ce5a5f1e27c564af17a01773
font_02_sfnt_off0000e4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C8 15188 bytes
SHA-256: 4e8b789aaf1aa6375dc4a45c01cc3e389473c5b35fff25d413d07990c437ea65

Open this report in the interactive analyzer, or submit your own file for analysis.