PDF malware analysis — malicious · 63f4a4c8811ef634

MALICIOUS

PDF

72.7 KB Created: 2021-07-03 01:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 12d45dfc3a3ecc0aec0d06a466537c81 SHA-1: baa960ab84e6896d0e30c7944d095780f930d747 SHA-256: 63f4a4c8811ef634e6d91683f9cc5bc6c87e35fab8302410166e6a27f6d085e5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to lead users to phishing pages or download further malware. The document body is unreadable, but the heuristics strongly suggest a malicious link distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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 http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/15133478311.pdf In PDF document text
- http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a71808e2e93---tovuwifilonemafinujuvuri.pdfIn PDF document text
- http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a95a5ec6c65---nazumubawikotuwi.pdfIn PDF document text
- http://boothbayharborshipyard.com/userfiles/file/2767754181.pdfIn PDF document text
- http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35b8e800e---14870081916.pdfIn PDF document text
- https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/1db1d52f5aa1aef8715d218ca190961d/12570413063.pdfIn PDF document text
- https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db9099228b7---63304932534.pdfIn PDF document text
- http://planbmedia.hufiles/pozasitujorixozu.pdfIn PDF document text
- https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/4071a7b89411c633e3aed54cecec554e/1363967833.pdfIn PDF document text
- https://facades-et-traditions.com/actualites/file/kakanigajidijeji.pdfIn PDF document text
- http://fitviewer.biz/files/file/1369578492.pdfIn PDF document text
- https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f58a33d20a---51343287901.pdfIn PDF document text
- https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c746ac901b---69929629576.pdfIn PDF document text
- https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608158947d92e---66344415793.pdfIn PDF document text
- http://www.alexgis.com/siteuploads/editorimg/file/86679560025.pdfIn PDF document text
- http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf526d3b48---58093881059.pdfIn PDF document text
- http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b05bbd87abe---31142304174.pdfIn PDF document text
- http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/3011877854.pdfIn PDF document text
- https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/b5963d751450ab12f80e93913dab07eb/bemisuliwikepisukuxonumuz.pdfIn PDF document text
- http://baugeraeteverleih.de/benutzerdateien/238590101.pdfIn PDF document text
- http://dush-kz.ru/uploads/fck/file/nisonumumolufo.pdfIn PDF document text
- https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/43040f57c002c8aa5f1929c690d5a630/99768675007.pdfIn PDF document text
- http://activesolutionelectric.com/images/file/54374677557.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a92b185b90---janak.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=find+the+lateral+surface+area+of+a+rectangular+prismPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000bb72.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBB72	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d389.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD389	11144 bytes
SHA-256: `eddf47c1c338b4b97af446fd444c12c8de7eb5061e4e7e5fdca9dddeb397018d`
`font_02_sfnt_off0000ed1f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED1F	15496 bytes
SHA-256: `a63cfa3b94727885b1e5cbcdcbbd3bff79444d17842c0e1e46c5ce442fae833d`

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