Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c242a928af9e11b…

MALICIOUS

PDF

90.9 KB Created: 2021-08-19 19:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ad6bbc2806bd7e5a1fd7518aea3a8dd SHA-1: 1c22c4e07305dfa53f1b6d06234820dcb11be7cf SHA-256: 4c242a928af9e11bc3916b89d515802d12909a35beb160a7cf1284400d5289d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple URLs pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the attack pattern of using link farms on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610054d5dc349---nizamanoke.pdf In PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/57489866042.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/wubokosukugilorimami.pdfIn PDF document text
    • https://coevent.ru/upload/files/53018268740.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/julojij.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/85584712131.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/48u4eokfmi0hqae1qpv4ri0c0o/nixezubepat.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4987859ab---papusejudogeb.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/68265331550.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817fda8c233---8922420187.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980afbb20fa---furukawa.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/rr640eahkv16f6vlh4e3oma0pv/24318996626.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/kujisirixabolim.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///65605119902.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3a5ejnn4bv3er0i7ipnh5i3s77/35568114564.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074547769d70---tizidage.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/4c72b2d2f5e8aab6c5cf58be2314b388/piwutamiwexuzujumitagov.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/af48a8cadbd86f84f99f573148913f8f/89147482375.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b21a2210c2---paxoxesuxaxulufetanedarin.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/85822924802.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/2928414845.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/71757571863.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb397ec497---97773150829.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/35361905676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=why+are+ships+so+expensive+in+star+citizenPDF 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_off00010084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11896 16632 bytes
SHA-256: a659f94b2d47fe8c2977c0b7b7d5b0e5c150314526ebd43f8053545cc057c718
font_02_sfnt_off0001439d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439D 10760 bytes
SHA-256: d40a91b0c08639590a28643dfe1d92a6a1b5a665dc353e4027c28ec1b30427e6

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