Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2fc3d4f4b4f3b98…

MALICIOUS

PDF

163.9 KB Created: 2021-07-13 16:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fc11842574fe9e16f52b28cedc5d694a SHA-1: 7ab1bce4781f903d13e9c2b50ba3d3d1fe3792a5 SHA-256: f2fc3d4f4b4f3b98139d4a80fe794be00429d274acaf18c3175f02f01754798d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings clearly point to a link farm used for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc44802a30---nidawer.pdf In PDF document text
    • http://geo-equipe.it/userfiles/files/19906170592.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/32f784919c4a5479a8bdebc6d4b323fc/38778102075.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160948e0a68f0d---3448790042.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725754d7cdd---gitinewibolaporoj.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b921b664d0e---9403377781.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094de1524f8d---75338562153.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/xamuk.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052220474895.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/demedorojaxetuvixutu.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c619534c749491e521fb3c4ff8621393/toxifi.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16209215428336.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/wewutipadef.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1ea0542af---30443930789.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072f3b6a0c7e---sufojinesuseledufawetil.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/gevufijiga.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/ddaaa33ad5cee734f6dfbb470a587350/xiwolemivujulekonewageliv.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/7f0702731b58d027e22709ebdb8017ff/vubebatuvuwurenava.pdfIn PDF document text
    • http://hhcreunion.com/clients/4/43/43f38dc94a4d709fe78decf5bd9d7370/File/95226903687.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/61645819120.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/eb74cbcd43def82bb5cc00b2c44b5b2d/vegigaje.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160beb878369b2---faluvonuxufigezi.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/e1b2f7df68300c2e85d85b08d04fbacc/18730309060.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f430a134c3---55496982628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=papal+infallibility+catechismPDF 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_off0002271a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2271A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00023f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23F31 10780 bytes
SHA-256: 4b8e0548e7d82f6f91c752763ca6e216919a9980d0303c78996e3ea84a201eae
font_02_sfnt_off0002579f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2579F 16372 bytes
SHA-256: 7e129839a6294a42734929f53e0a6c062273d50ff64aac3c3e23f6ab63c6e20c