Malicious PDF — malware analysis report

Static analysis result for SHA-256 8738ce5cd03ef967…

MALICIOUS

PDF

75.1 KB Created: 2021-09-07 12:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ef984a8fb007306d04b565ed636a4ee9 SHA-1: 109c4aaf033efb5c98db8440e255403eedb388e1 SHA-256: 8738ce5cd03ef967741e47aaa66765398c0fd53946bf877e0a70b0c228ac6fb6
184 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and multiple links pointing to external PDFs hosted on compromised CMS upload storage and disposable hosting. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or initiate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hanilkwanla.com/uploads/files/26256672251.pdf In PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/bobizoviwogajazevagifar.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/tokeranezonaxusupafevez.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ce2a7bd65381b4668f83fc8ef1b6fcb5/xajirame.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785fc7e54ea---58997901866.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16071a582d04a6---bomifefikokexetusu.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969dd4346e5---nupudimixalujutunigi.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/ranaririlovixijagib.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d7126797c9---wurumofebomevopujedubu.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/hhl7p9e2i7m5v5k80gdn929ne2/11916241389.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/9935c756854aa39404bc5eb58afcc2bd/35996848932.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/13161746884.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/pikisadi.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/fifanazijimuzo.pdfIn PDF document text
    • http://vanhacollection.com/images/files/83733408060.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/h51hdv2v17fmussma0e3er6a6u/6777174928.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/dafiju.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/wonafafoladimesufobe.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126fc7e1447f---87055660975.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f73683e2c1d---fawopulotakujanepofij.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/4578877369.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/30904891712.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/488e74fa88a838318fc66929cda9c9a4/sekelejopobip.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/32cc41c1c9c8f884ac7fca0daef574c2/25914174356.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/41238625558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=jandy+lt+pool+heater+manualPDF 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_off0000bf88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF88 10604 bytes
SHA-256: 030a6a3f4ef158f478cdd0eefdfba275e94dbe584f58fd13ee811d538973e959
font_01_sfnt_off0000d790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD790 17508 bytes
SHA-256: 0fdfe4d8f175d244883d2fd75b89e8d3dca77a9d57d31ecffdc689ecc3857c17
font_02_sfnt_off0001052d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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