Malicious PDF — malware analysis report

Static analysis result for SHA-256 4018a18174cd7201…

MALICIOUS

PDF

71.4 KB Created: 2021-09-28 07:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4863b3607d87a8863c072254aa7b75d2 SHA-1: 34cc83fd87bded3aee80aef2816674976777e5ae SHA-256: 4018a18174cd72017faaf7aa1990cf31e2e71a878689042e2955f5be5a1f92d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3288d82d6---32778105075.pdf In PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/346fe2cff9ffd0fb5a983720c61c27b2/kigutuzexibubidixegofe.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/94601328673.pdfIn PDF document text
    • http://caythuocnam.org/images/files/67056085578.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210901_25C49E479995245C.pdfIn PDF document text
    • http://yongqingtech.com/d/files/37383238607.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/saletetaba.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/jububufevukuxasevuw.pdfIn PDF document text
    • http://chinalabware.ru/d/files/93459885546.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/13568730797.pdfIn PDF document text
    • https://archicakedesign.com/upload/file/1737505684.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/61439168790.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/fifanet.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/3450878135.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee9c1399cb---nakilekigowenomekigopotu.pdfIn PDF document text
    • http://portableandcool.com/files/files/7494470613.pdfIn PDF document text
    • https://tessuno.com/upload/files/6130ebe1e3ef4.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/31947712088.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/wunoj.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/85262406790.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/rosukud.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210913190740.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/mopanelevalenizuveg.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/vakagoxunazez.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/9384312653d1aa0b83c074ad9f038dcc/musidomup.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/sasejarupilijidavimifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=best+android+obd2+scanner+appPDF 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_off0000b616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2D 10776 bytes
SHA-256: 65ecd956afdd4c8921c939d84abb12f3100bb313107b5d59a44ca1a58b3f99e4
font_02_sfnt_off0000e6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F5 15716 bytes
SHA-256: 8016206eb26b16118854bb49da97e0a9675f8059651b119f4b192473e2693e23