Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c7c3026c731c53…

MALICIOUS

PDF

90.4 KB Created: 2021-08-01 05:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fef83768a40f109fd1af724c7260f0d0 SHA-1: 2b96999360629aa6d226bcf830f86b28232c0fc2 SHA-256: 56c7c3026c731c5333751e7126b2792982bdea6bd9481cf37b32bea2f2aacc5b
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or lead users to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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 http://netinflux.net/userfiles/file/zevilovakus.pdf In PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/tobiwawogavumogujujib.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/2825db92afbe8efc7984346be13edf7b/51023535315.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27ddc9e9ee---52402237857.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/timirok.pdfIn PDF document text
    • http://inercial.es/uploads/files/bozubeg.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/15856774962.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160745db324d87---lalapejepado.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1eaf24677---ratowe.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2df5377599---penidu.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16091371a5caca---83512208452.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/d1a18e3b820713cd7e64d7e99ec356f5/nazamofen.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/fafegofiwavozife.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/1030092721.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951102247de---baziruzubajidaxowa.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/95010314993.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ee7dbe6d9---tuduwagibamalowamo.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/kawaviwekunusimodarager.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/13852413077.pdfIn PDF document text
    • https://serka.com/serka/upload/files/45593656593.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/gduiiooq7nmingtbt42i4bt1r7/58633657923.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/63125019867.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/o0k6oodokv9j5faks38h3l33qs/doviwemuw.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cef75c4676f10ef54a3a79c62f5071be/wamunamozofagedux.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/bubukojeku.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607adf00d4b1d---fawuxagulerobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=conceptual+physics+problems+and+solutions+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_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 11268 bytes
SHA-256: 75b361f9bbe04e45d014f62e88e1eda011d3640dd37cfbc1720a76a08d5ec930
font_01_sfnt_off00011840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11840 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13052 16284 bytes
SHA-256: aa09ea7e80e9cbca5b51325244b558fadd407a31f086ee52bf4eb0f3d57e0796

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