Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0adbe824635558d…

MALICIOUS

PDF

90.9 KB Created: 2021-08-16 14:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5a41d5e21bdab036e0ca6f03ae3457d3 SHA-1: 2aab40b226e342133ded28a34fedc13d87a149ef SHA-256: f0adbe824635558d514801834893a16bc50261df79dc398b335a8f9d8012111d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/42ffa27c2cd0e6c0786adf8eeece7013/woletagoxavolifutogukiju.pdf In PDF document text
    • https://nutrishop.in/ci/userfiles/files/64624318536.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f8fdc0e87---34013345271.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/nazalufisamadufix.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5c74c2c719---bixererezejipon.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10c48f3bd---saxuvamumilojenuwep.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd522e906b1---18701607962.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89e3a2d513---gejalusupuwuzajakepopawos.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/84328375572.pdfIn PDF document text
    • http://longhornrings.com/clients/0/08/08da48574b41509ac7bedcf2500dc652/File/fajurapugi.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/fipegezunuliwomaki.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/bfadf601d6c0557420e98187ffd82e5c/wixatijipuzejuruxane.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/98507780434.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/juwubinewa.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/nakijidufopa.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jelavaberaloninap.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/wesujokezol.pdfIn PDF document text
    • http://weiddy.com/uploads//files/202108031229366675.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/dd53c069f70955c03895b603dca674b8/bugunev.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/73518968783.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/wufipolaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=mashallah+in+arabic+translationPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 19812 bytes
SHA-256: b6f6b810693076e6b2a29f6c03d5d13b05ee3c68fa3108bdb7303b81f66c4dd1
font_02_sfnt_off000129c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C2 18104 bytes
SHA-256: c7c85c24e594d1b62fd27fb9de8350b27ec0bf1768c7fc082839b818b7d4305b
font_03_sfnt_off000146a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A8 10328 bytes
SHA-256: 194c5b843adb2728cb30f0c040c4b4848e36910de4ac7c615d38bc1a14405631

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