Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b393e4115f981c1…

MALICIOUS

PDF

75.3 KB Created: 2021-08-06 04:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 597540b6a9e8d3cfe5926909afa6f33c SHA-1: 7ff3d924b516607340de49a18eb2e18430edce27 SHA-256: 3b393e4115f981c116ca811c028e540ee40431fc6d254cba04f4503b8843e562
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and link farms suggests an attempt to redirect users to malicious content, potentially exploiting vulnerabilities or delivering further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/19dd0861a80cc41ddfa2c4b91867d454/muxoxo.pdf In PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc1463dd11---nobatiw.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/duwedozuregakidokaretuli.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/abc4f2f54456325c20b24c1b6c86495f/78441240972.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/72008951082.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/67506788899.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/zozugowubuw.pdfIn PDF document text
    • http://vo23.ru/upload/file/gijes.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe232755f3---lupuwupaw.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b22261142f8d554586b30f96775bca4d/zulavonivixut.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/82763480942.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cda68a0f278aa4ebfe5b96935bc11451/94416530830.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/51959396385.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/75396544285.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4a7495aff486127f52fc5be2ac6bf5b3/renonixipalilukiv.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/llkhobhp6amp53hlbb3oi4knsj/85055691142.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/kafevevulidosasison.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/mupulapafapezubosum.pdfIn PDF document text
    • http://kbchina.de/upload/fasilefojapamonota.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/lefigurimujimudesirulujel.pdfIn PDF document text
    • https://kueapem.com/contents//files/mugorobabususovif.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a12d1842294---80812458179.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210722_6592B9287D84A86D.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/7541261874.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/xisajafi.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/junomelofefafavejagabujav.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/21715620424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=where+to+buy+similac+alimentum+ready+to+feedPDF 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_off0000c082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD899 11088 bytes
SHA-256: 1773aec337bc91f4eec132974a401cc4702bd9dae815dd6dc947e4d24958e4d8
font_02_sfnt_off0000f24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24F 17532 bytes
SHA-256: ce2e088900a57cf026696969199d230681cfd13e4d2f30a6062c030be1a886fe