PDF malware analysis — malicious · 39512121214f2ae2

MALICIOUS

PDF

104.5 KB Created: 2021-08-05 05:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 72b5822fef49561904741fb14da5cb38 SHA-1: fdf2b9c60b848e9072a80b5fb2abf1f2ef1ef986 SHA-256: 39512121214f2ae24eab7d264150c476f49fec959aa5df0e30bf7426602f3623

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 0.9618

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://chcial.ru/uplcv?utm_term=que+es+variacion+ciclica+en+estadistica PDF link annotation
- https://edu-mate.kr/_UploadFile/Images/file/meradifijapajodawugimo.pdfIn PDF document text
- http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725433be5b4---9103600069.pdfIn PDF document text
- https://soudurelauziere.com/upload/editor/file/galiganutejexotidov.pdfIn PDF document text
- https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/321235f623c6b7ef1c52120e17229f8d/pefatu.pdfIn PDF document text
- https://healthmatters.me/userfiles/file/fajeso.pdfIn PDF document text
- https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00f7e1fbe9---58919557849.pdfIn PDF document text
- http://zhengfutz.com/v15/Upload/file/202161083263513.pdfIn PDF document text
- http://owtsreunion.com/clients/e/e7/e717deb27d844c69ffc49b2d3c0bb1a5/File/3563503628.pdfIn PDF document text
- https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/o8trmpqmrve205776qdmu80p4i/fidifofebogokisogapo.pdfIn PDF document text
- https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/5f6thauhiio7q5oetqvdguk2cm/80447008050.pdfIn PDF document text
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad619eb2cda---92794485832.pdfIn PDF document text
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100c3fa92a31---gusox.pdfIn PDF document text
- http://udmvdpo.ru/images/files/fezorugewakiviruwowegabi.pdfIn PDF document text
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/61eacae7ca75808734bacfc0117ec0b4/jurebilenulaxovadixezos.pdfIn PDF document text
- http://haciogullari.com/depo/sayfaresim/file/21219813384.pdfIn PDF document text
- https://85097781.com/upload/files/maxuxekopuxepa.pdfIn PDF document text
- http://cepsagibyachtfuels.com/images/photos/xafirapalugevix.pdfIn PDF document text
- https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/f41cc37b2519e5d26ab12006a70361f8/lunusiluvewagazovisibazep.pdfIn PDF document text
- http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe7ec185e4---soxixa.pdfIn PDF document text
- http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/2d5e5913dbfa424d92cbc4de33950558/birofovola.pdfIn PDF document text
- https://moto-trend.cz/public/files/fck/file/nedoj.pdfIn PDF document text
- http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a82544062d---87739594318.pdfIn PDF document text
- http://skrn.cz/pic/file/wusufogizaborajekunega.pdfIn PDF document text
- https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d68aa976139c0a780f7f46decc932cb8/2762279231.pdfIn PDF document text
- http://straub-online.ch/userfiles/files/98528640014.pdfIn PDF document text
- https://techson-cctv.com/upload/file/50713707922.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_006_off000174fc.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x174FC	18312 bytes
SHA-256: `82a447a2770fcbc4f418e06f85fb6fa5b354db456271aaafe1f2bdf2965167b6`
`font_00_sfnt_off000112ae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112AE	20112 bytes
SHA-256: `9952be4bfa3c5fdc37a2c85e726b7a7a48c9291c4733b80c2adba4485f4b8c58`
`font_01_sfnt_off00014477.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14477	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00015c8e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15C8E	10588 bytes
SHA-256: `76842f56620b762336fde180dcf0fccdf52d954ec884ed059a3a7b337c71f6a0`

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