Malicious PDF — malware analysis report

Static analysis result for SHA-256 900f931413e0f4ba…

MALICIOUS

PDF

92.6 KB Created: 2021-08-08 15:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 618ba5148328a00ad6e10af9f62f4c76 SHA-1: 8e3efda5d26c3e7cc986102c0bc45e2026139c19 SHA-256: 900f931413e0f4baf3f44d8b9332f7e05adcb794dee4df1b2e0efca28e7bab81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites, many of which appear to be hosted on compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf6bf0d6dc---43326047298.pdf In PDF document text
    • http://fecirturizm.com/resimler/files/58198270740.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa4e869175---mositugugasa.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/qgqnbpqm39jr2l4kkd8gquu4u1/tobonejotikokoxekazelujen.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161024bf76d4f9---587548327.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/54673926172.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/16374188512.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/madupofukuze.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/80270448381.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/86011584798.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/4kgh9ucofk3a3nifop3vdi2ius/15558712246.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/cdbahn6o3ch0nfvhb235hn65sk/4269933912.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/90489524178.pdfIn PDF document text
    • https://carlojans.com/cms/file/rilev.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/tinifuniboki.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/32df6ca0e15a3ea669b0a9dad5e2474c/vagiruzagozakiki.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/28245908365.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712aafa6182---wamizexidefedupapuwepi.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/nilikokamizudamididab.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/84527216688.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/kudinanawo.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/7h08fqk1trkjl7q9ubpth3d9df/64306530478.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160b6dd9ae1048---fevitoriseza.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/7433310254.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/gowosawemej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+start+a+self+introduction+in+interviewPDF 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_off0001038c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 17812 bytes
SHA-256: 55a38da567384da0ca1d1c30af03250dec24563b82d2d6f30fd3d8bffbfa5454
font_01_sfnt_off000131b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B3 10712 bytes
SHA-256: 89937f7e1062b1fc065799e4c2c2d0e12619efef514d4ef61d410578147c44fb
font_02_sfnt_off00014a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1