PDF malware analysis — malicious · 439d964509bcda6d

MALICIOUS

PDF

86.0 KB Created: 2021-07-05 19:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 6edd2b80be22ec86e4b6cb3c788c76e6 SHA-1: ac219e9738cf8df9f92c8e170aadbbd47b86f9ea SHA-256: 439d964509bcda6de69c0c1ff10b0cd188513a6a4e3222d31cf0244c7e7ec366

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a malicious PDF identified by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on compromised WordPress sites. The primary attack pattern involves directing users to these external sites, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly indicate a phishing or malicious redirection scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=dmitri+mendeleev+periodic+table+facts PDF link annotation
- https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/252p9bc1gc30tdnebgoft0hc41/koxepikevadesor.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752b1a8484c---17651394716.pdfIn PDF document text
- http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e6681e8a6---sazufas.pdfIn PDF document text
- https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b45dea04999---bisoraluxoxeda.pdfIn PDF document text
- https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/55d258281841bbd49c9317b93ccd47ef/mewakofolajagaku.pdfIn PDF document text
- http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/umak5ftb3gsm0i74eeas9ha4d2/85193803496.pdfIn PDF document text
- http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093675869202---dudar.pdfIn PDF document text
- http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b72443ca3dc---77199477679.pdfIn PDF document text
- http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1c415db244aef264d8b2549e17e8588a/20242373758.pdfIn PDF document text
- https://airflow-skateboards.com/upload/file/tejafimejutalire.pdfIn PDF document text
- https://clubsportedinburgh.org/userfiles/files/77910003281.pdfIn PDF document text
- https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fe89d4b07---23661068483.pdfIn PDF document text
- http://statewideroadservices.com/clients/879378/File/vopakimavojes.pdfIn PDF document text
- https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/8947bf6ca5dd548829595e03ab0635ac/91649854159.pdfIn PDF document text
- http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/8dua1vn8t81os0q4t25kc6mfic/22899436998.pdfIn PDF document text
- https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/u8hrm6325chb9sr2qo3mp41qt3/90669216945.pdfIn PDF document text
- http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1c1161464---71299320876.pdfIn PDF document text
- https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a704da5ba3b---xawolabapenosubiburoki.pdfIn PDF document text
- https://auto-rujo.com/images-editor/file/gusumoli.pdfIn PDF document text
- http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3128ccefd---lowekuw.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aacf408a7a9---74855084733.pdfIn PDF document text
- https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5c7423b67---napawupokivutafom.pdfIn PDF document text
- http://loscogliodifavignana.it/userfiles/files/pumerubapuninowelumapuf.pdfIn PDF document text
- http://regiefranchet.fr/userfiles/files/lavuzatizamubev.pdfIn PDF document text
- 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ea9e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA9E	10988 bytes
SHA-256: `23f55069dc88d22499be3c58da75923a5aed967fb6b13296f06d6a227568b359`
`font_01_sfnt_off000103e6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103E6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011bf8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11BF8	17172 bytes
SHA-256: `c7315a78bc6b1f0e9c88ce19b7c07fd2c24603286a4a8726a0d711ec1b397dcf`

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