PDF malware analysis — malicious · fcf88bf9b41ba465

MALICIOUS

PDF

75.8 KB Created: 2021-09-17 02:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: a3573bf9b05c67664d7119e31d367d9c SHA-1: e8eefa6d3186e264124b16b9c001968f5beb1157 SHA-256: fcf88bf9b41ba465e8710fd7ef1e26db10a52f8a5b1ea2c8cc43267b1d5c7e22

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. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage, likely to host or distribute further malicious content. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16132747bf0b09---bediwibonedupuniwuw.pdf In PDF document text
- http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141699820267---37871359343.pdfIn PDF document text
- http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f454c77c4---70066695860.pdfIn PDF document text
- https://krainaogrodow.eu/zdjecia/fck/file/mexomaf.pdfIn PDF document text
- http://hkxhjfc.ltd/uploads/files/20210908055045.pdfIn PDF document text
- http://noithatphathuy.com/Images_upload/files/13444445164.pdfIn PDF document text
- http://philipp-haberland.de/images/upload/file/55407272115.pdfIn PDF document text
- https://toscanafantastica.com/userfiles/file/34185449131.pdfIn PDF document text
- http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132c6be375db---xafubunizefu.pdfIn PDF document text
- https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/126e353a105126b3e57d29e6cdf5d940/8018818986.pdfIn PDF document text
- http://iburgisidimarsala.eu/userfiles/files/71620781699.pdfIn PDF document text
- http://bundoreh.com/fckeditor/files/file/pedabinalata.pdfIn PDF document text
- http://www.tiande-global.com/ckfinder/userfiles/files/13497883803.pdfIn PDF document text
- https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/8g7v228g9i3b6bp80anmag0il4/17327901552.pdfIn PDF document text
- http://torgoborud.org/images/file/68232388661.pdfIn PDF document text
- http://sumisaedu.com/FileData/ckfinder/files/20210905_4A7C054C888C9414.pdfIn PDF document text
- http://gongotour.com/FileData/ckfinder/files/20210914_5F0B1A1AD3E33E49.pdfIn PDF document text
- http://gorillatheory.com/admin/upload/file/rilarujopivegoguridisufow.pdfIn PDF document text
- https://merohamro.com/ckfinder/userfiles/files/gofese.pdfIn PDF document text
- http://sm.ac.th/ckfinder/userfiles/files/16297172760.pdfIn PDF document text
- https://kolkataangikar.org/ckfinder/userfiles/files/58315949042.pdfIn PDF document text
- http://taikenplan.jp/ckfinder/userfiles/files/kipetajuwufekavutimekub.pdfIn PDF document text
- http://thayloilocnuoctaihanoi.net/upload/files/39892375576.pdfIn PDF document text
- https://sjamsul-hidajat.id/ck_uploads/uploads/files/4692987965.pdfIn PDF document text
- https://pasarangroup2.com/contents/files/20437385282.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=enable+ldac+androidPDF 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_off0000c786.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC786	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000df98.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF98	16512 bytes
SHA-256: `b6982eb8ef653653cc2dbef0b5e46efc37358f1b93f79e6c1d70a465fe08e489`
`font_02_sfnt_off00010a2f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A2F	10220 bytes
SHA-256: `3f6e0255c789d1a938273e10113641690f98f9286d3b1c1c07749b99bd0580ce`

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