Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2c2ec57987f03a…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 16:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3155c03a4553c892e80454dc2817f13a SHA-1: c76511fb24d8fd8926da252a595e4ee155e9f2c7 SHA-256: 6b2c2ec57987f03ab307dd0f98c45829dc23f5122a0a69992efe4f361fb0f23f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The primary attack pattern involves luring users to click on these links, which likely lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://drafthe.ru/uplcv?utm_term=watch+smackdown+live+online+free PDF link annotation
    • https://girisimhaber.com/uploads/file/sifubusubize.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/zetife.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/nezabamuzinodinoneri.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/89829501241.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/127b2ae941537f58f13ff312a150e876/nuzizewasajaveru.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/ef2abf03260f6f94246ffac78a40c4bf/17481155981.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139be0d8ab9c---begalomunixupubif.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0e553eb13---vobesijokoja.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/dusopibiminijewuna.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec96fc2865---72817618653.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/71508746631.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/434a5d5fd6363c0a89b405151332e23a/gatezokikimerodo.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/da5e44f0e5f8925096701e9af2f914f7/pulovesibe.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/dolisixazonoso.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48854898266.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/lojosukowaju.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/pokizerefoweloxinejoz.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/fizegal.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/69790423685.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/torejiremuwediku.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/dalejawab.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/50577251969.pdfIn PDF document text
    • https://maisonforville.be/documents/file/26090444210.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/59039295243.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/2464758328.pdfIn PDF document text
    • http://sujoydhar.com/userfiles/files/mesigogotasava.pdfIn PDF document text
    • 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_off0000b3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F1 16424 bytes
SHA-256: 834567999233d8089f678abcadbd0f3f98d11a8e907e4e41f70b69d5c1d6035f
font_01_sfnt_off0000dddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDB 10980 bytes
SHA-256: 8dd89c6c5e677618246642ed078f7ffa541d33c40d9351703da797415088e95b
font_02_sfnt_off0000f737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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