PDF malware analysis — malicious · cd4bd8c50acc9e30

MALICIOUS

PDF

81.8 KB Created: 2021-07-22 17:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 11a79d3c82b13321139400bd61d3f68c SHA-1: 1d4dc92ceb027cfe1e56e9213495615794c9ca8e SHA-256: cd4bd8c50acc9e30cc36f84fb04f45a10c2c7fe30dbc1c28ac659fd5770a1bc6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the ultimate destination. The primary attack pattern involves luring users to click these links, potentially leading to further malware downloads or credential harvesting.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092a7b103491---39879163381.pdf In PDF document text
- http://commsoft.nu/demo/ktb/wsmbilder/files/nodaririregi.pdfIn PDF document text
- http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/r3fa2r9qd1ptvoe5c573vbj0j5/3497688340.pdfIn PDF document text
- https://bcbc3399.com/upload/files/banolijite.pdfIn PDF document text
- http://vitanova-cattery.com/upload/file/fipexajukiroporavebir.pdfIn PDF document text
- https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/a03cbee0eef6a4b2963901fa8f185d7e/mekemepunutuwep.pdfIn PDF document text
- http://ever-pioneer.com/upload/files/wawefunopunevus.pdfIn PDF document text
- https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078f3a46c12a---55119320681.pdfIn PDF document text
- https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160de95c872838---88949179183.pdfIn PDF document text
- https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f87d862ec6c---86348832821.pdfIn PDF document text
- https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/7035a5e30be1770161ce41399872d20e/fobeguzexagalogiwev.pdfIn PDF document text
- http://namthangbasaltstone.com/uploads/image/files/lavof.pdfIn PDF document text
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a996b00899d---78777929267.pdfIn PDF document text
- http://caigeshi.com/uploadfile/file/2021070608480573499.pdfIn PDF document text
- http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8db006a846---xuzaromiramekonedasip.pdfIn PDF document text
- https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e313570252b2044a0543dd03227e14cc/8842088993.pdfIn PDF document text
- https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbbe5e5217---69097820004.pdfIn PDF document text
- https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e421c9d2119---3183176034.pdfIn PDF document text
- https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/12a5890cbc2a28e9a1e3aaaf6a856329/jodefukalawikikubadap.pdfIn PDF document text
- https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2e834f60e---80542563242.pdfIn PDF document text
- http://jessie.vn/images/ckeditor/files/33600254924.pdfIn PDF document text
- http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/2f2bf51c41012c5dd811aaa428928377/pewosiwilopusipi.pdfIn PDF document text
- http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba74f40e421---wewikuvasofamuvisajilo.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ethane+to+ethyl+bromidePDF 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_off0000d987.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD987	18148 bytes
SHA-256: `c9751341585715ad630e9292316a74da4c74bad885ff2b4fb0317c41f8574516`
`font_01_sfnt_off00010947.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10947	10584 bytes
SHA-256: `e6f20d5d36c18f9389d6a3c3a77bc69a113ef4af62fddee45680706bf9451d61`
`font_02_sfnt_off0001212d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1212D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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