Malicious PDF — malware analysis report

Static analysis result for SHA-256 00f9855784c4c48f…

MALICIOUS

PDF

87.3 KB Created: 2021-07-17 01:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4b5e56bf94a5ed6079963e932db89373 SHA-1: fa4e0db5bdd4d68c3bdce8932f5a699ce391ee60 SHA-256: 00f9855784c4c48f98d4a5bf37772b69763d24ba4dfbd723f6a73f8833470182
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress sites, indicating an attempt to distribute malicious files. Heuristics and ML classification strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan. The sample likely serves as a lure to download further malicious content from these compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c4490fe2c40---fedobumulivuxisoxa.pdf In PDF document text
    • https://vildmarksjagt.dk/userfiles/file/vopifunuxew.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/pebet.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1be300e16---10723848478.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/tekewubomabusanubef.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/zovedemavimogoxabex.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c10a1edc00---lesowenifuweti.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/1bcf2edbd460946ad8a7c71beeb5c62a/lerosuj.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/29b2af45b56cbd663423e4d5cd2d3479/23717424932.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751bd5e5186---xebevojojoma.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca45ece951---wozikobixu.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/zafurofevaxosidowigoverak.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/29126351b098904a28e02e6339557bfb/sagalosomenokixugowus.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/10359489287.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/421e2e9c7589d40cae399dff6e563eab/kixodis.pdfIn PDF document text
    • http://kotolantopeni.cz/file/57735722792.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7a758dfcd---29249243268.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/49904298361.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/mipasojijijanovijal.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/pukatilo.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aa79b8924---93158181149.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/62e9c09c87cdaf5c6d8c3d113fd977b9/65915586552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=allegedly+meaning+in+teluguPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 10400 bytes
SHA-256: ad583d32a31f37a8e312606d91f6c81354911d9a295b81c6ae6e5859916a8dad
font_02_sfnt_off00011998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11998 20828 bytes
SHA-256: add3244866424a4559f164f1dffbf0c140d808844e6932871cc17fb933a54f77

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