Malicious PDF — malware analysis report

Static analysis result for SHA-256 42066f1c44d34438…

MALICIOUS

PDF

90.0 KB Created: 2021-08-03 06:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 79f1e3241f410af1d37eca54dae73c63 SHA-1: e368756fd34030a720dd1e3c10b776f3a5288e96 SHA-256: 42066f1c44d3443838ab77ee74bc2219156d77c47d0da63d1e77c52856c733eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are then used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e43d1141f---13185423443.pdf In PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/f82613bb0c6927fdfb89b311f7fed256/domudekelirofibekaxezake.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/luvusuvekafugesikevo.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/92143944156.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/dejozina.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/wubotudexidositirowi.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/tibogejamis.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/1410854857.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/ccb5dfda9825cd966610c96a7febad49/92339280843.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/tukunatenasipomeniluweveg.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/fipuz.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/42d82bca8801c52b1f38065f5fa2ae3d/15259088231.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/12f0b4ec8a79562f3e95fd14cac26d77/89134257557.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vowapuviguwogevarefiji.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/47554171729.pdfIn PDF document text
    • http://nktrading.qa/file/files/33733630979.pdfIn PDF document text
    • http://famillespourstarlight.org/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/zowufuneviturumo.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/jb3kohsm1al171pmdam7mgikks/sapenawolew.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/55503459469.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/votuwanovekoxesug.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/2587888763.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607e5efe5c4ba---60051387897.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/96849500245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=should+the+electoral+college+be+abolished+dbq+background+essay+questionsPDF 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_off0000fd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001159c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159C 16328 bytes
SHA-256: 03e336028059fdc3379f420da7e7b8d54c4663e760814b056a457235c4a9ce7f
font_02_sfnt_off00013fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB1 11316 bytes
SHA-256: 2bd9af809094ab0cff54a9cfa850bfb21015521a83add4a876d23511b6f5ace9