Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf0ffe7f977a5e2…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 03:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c5ee1e1b01d803b365345a66b97977e6 SHA-1: 72dedee14e1c4ece2beee5a5d8895e269907ddb2 SHA-256: 9cf0ffe7f977a5e2b7ea635624dced8cde9a5f13ede836617a75f0a4cc3f3394
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress upload directories or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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://konferencii.org/js/ckfinder/userfiles/files/muwok.pdf In PDF document text
    • https://cyberbirddog.com/userfiles/files/zawokefetusisapaxa.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/1q7pipr0ahgbtba2cuqmg4kt44/51407981897.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/85483174201.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/nafidanizewudebe.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/tenojikafafufaritunupena.pdfIn PDF document text
    • https://beltamas.by/content/Files/47649578863.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/96265583710.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/weditisorotosubaba.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/35461925432.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b16cf83388b---95499846069.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/so74nrasudqrsloc24c63env79/35543590167.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/avp8kk8nm1ajhbkf1kl0m1nstj/21513126980.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/6202950459.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a104a763e---rikanarule.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af784885c73---82122704491.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/t7nncmbebpbl94u8det7uhue4u/xusinibovepevumo.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16125d37f5f1b8---putazoravizimomozi.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611c93ab2ad6e---ponitunuronosi.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/7274179571.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083856ee4bdd---67510236811.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/31955591855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=test+your+knowledge+in+chemical+engineering+pdfPDF 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_off0000d601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD601 11420 bytes
SHA-256: d46aaa6211ee15e96702900085f68bba07c95dc1f75af48f860f5e8b5bc46a61
font_01_sfnt_off0000f0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 18376 bytes
SHA-256: e8db1b6ffe8f53c2364b17c3237f65c8635db81fc0277d59cade13c07998ce59

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