PDF malware analysis — malicious · f39beb3fabb17e66

MALICIOUS

PDF

90.2 KB Created: 2021-06-27 01:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 8df51b9824ad5ac664f92d6beb07b65c SHA-1: 5d1ce0b1020d9e06ec26c8527f31ec8c46c7ffae SHA-256: f39beb3fabb17e665465449ba0012a50cdc3be777af4fdb9244a71c4fc7e1949

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure, but the heuristic firings clearly point to a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9952

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://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb4cc8145f---8493335353.pdf In PDF document text
- https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607717a245db6---puzosazajoboxitez.pdfIn PDF document text
- https://irish-setter-zucht.info/ckfinder/userfiles/files/depezirididotufib.pdfIn PDF document text
- https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/220ba15cd59e77e532dd55cf5c280a80/rijesosajuwovu.pdfIn PDF document text
- https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813aaeb2e77---fevevav.pdfIn PDF document text
- https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/cbf774f5bf4ee2a4bf089d69266578c1/sikolexet.pdfIn PDF document text
- https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098444e618dc---mupifiwovagivudapuge.pdfIn PDF document text
- https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609989a257542---luzetozotilona.pdfIn PDF document text
- http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081b8973420f---50683210985.pdfIn PDF document text
- http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f5525fa8d---sitixuw.pdfIn PDF document text
- https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/4d0e2b715cb26952136acab1875edae1/mazevuwotibalero.pdfIn PDF document text
- http://coreaad.com/DreamDataUpload/file/fonawibexo.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f1fd5a7f7---81672436109.pdfIn PDF document text
- http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e7d923ae9---50852822347.pdfIn PDF document text
- https://smilepaper.tw/archive/upload/files/bakilaviw.pdfIn PDF document text
- http://studiobaliva.eu/userfiles/files/wafed.pdfIn PDF document text
- https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe983e1ffe---19240394027.pdfIn PDF document text
- https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/6938198331.pdfIn PDF document text
- https://olivierdaulte.com/ckfinder/userfiles/files/92793561432.pdfIn PDF document text
- https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/322570d8761ad41e16b4c772ba6d217f/27459796259.pdfIn PDF document text
- https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/q2avsg2m4sq280ha12rgia58k1/nojigaxokofejojixapezimab.pdfIn PDF document text
- http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cc768e4ec---82358768076.pdfIn PDF document text
- http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3c6010a2f---9802623129.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=class+10+science+carbon+and+its+compounds+important+questions+pdfPDF 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_off0000fb3a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB3A	11372 bytes
SHA-256: `e78eb9c121ee6c19892f662389d30cc694905c23fd15e5297808448af595106b`
`font_01_sfnt_off00011592.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11592	17328 bytes
SHA-256: `3ac44b7d85dc9457eed0c2389ca1a652766700805819cbd53f2db49f960d3ebb`
`font_02_sfnt_off00014316.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14316	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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