PDF malware analysis — malicious · fb611f301a10496d

MALICIOUS

PDF

106.4 KB Created: 2021-08-07 17:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 8fb8b4a2bd3290c8f439cf6bd2c0c1a4 SHA-1: 665d4963795c1356ce0fbf771abbc4e3dccc8375 SHA-256: fb611f301a10496dc356e78c201725ad53f10d2192d89f623f726562e90a6fb6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

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 http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbaef855c8---mekewuxed.pdf In PDF document text
- http://merklink.nl/site/data/ws/files/savufavigaloxubufajusa.pdfIn PDF document text
- http://jorkurojus.com/userfiles/file/35892392063.pdfIn PDF document text
- http://faktxeber.ru/resimler/files/76933002804.pdfIn PDF document text
- https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082ef1b12f30---jupibipemumike.pdfIn PDF document text
- http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dafodiga.pdfIn PDF document text
- http://arniestribu.com/campannas/file/48696232080.pdfIn PDF document text
- https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85251697fb---rizofawef.pdfIn PDF document text
- https://feng-shuiworld.com/userfiles/file/mumifonekoludegedifusu.pdfIn PDF document text
- http://orosweb.hu/ckfinder/userfiles/files/49594718700.pdfIn PDF document text
- http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/9i6bok23jsvhve0nkvd8r555q5/totogiloverak.pdfIn PDF document text
- https://vieiras.pt/imagensprodutos/file/91994601778.pdfIn PDF document text
- http://demirlermetal.com/resimler/files/bonojoxiwafajajawejis.pdfIn PDF document text
- http://yangs-ns.com/ckfinder/userfiles/files/20210712212455.pdfIn PDF document text
- https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/db9336d5749a4ba15bc750594191c66b/6436383596.pdfIn PDF document text
- http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4bba7155a---67047820037.pdfIn PDF document text
- https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/r8t61qa1vl0h9mbiokcglbsia6/ruzoxanur.pdfIn PDF document text
- https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/6f3e599688f457937a0784129f7e39ac/paxenobewolur.pdfIn PDF document text
- http://turksebruiloften.nl/userfiles/file/5694214887.pdfIn PDF document text
- http://tlumacz-lipno.pl/pdrzewiecki/files/pedeji.pdfIn PDF document text
- http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160988caf95690---25845482668.pdfIn PDF document text
- http://zubrcup.by/files/files/lelagimetokotegizu.pdfIn PDF document text
- https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0ec072089---xijosenurukunirixino.pdfIn PDF document text
- https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073938881065---55837265331.pdfIn PDF document text
- http://vodnik48.ru/content/file/61064366992.pdfIn PDF document text
- https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/6ffb56c47153858bfd6d4234f3bf8aca/pumizevidelirisa.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=benim+d%C3%BCnyam+filmi+full+hd+izlePDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_006_off0001669d.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1669D	28536 bytes
SHA-256: `7781d6177b2eeabd56b12fe0e14d99b54e4466774c159688bd688cca19e2c877`
`font_00_sfnt_off00010111.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10111	10652 bytes
SHA-256: `18aaa8121aeb41679c27737ee58d32d6fbab605c4b2a2a3c7e48c44165d04f5d`
`font_01_sfnt_off000118ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x118EF	21948 bytes
SHA-256: `477119bec6655d2464fc565dcf04b7e292ae30c5e342c2499abbea1457f5d371`
`font_02_sfnt_off00014e8c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14E8C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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