PDF malware analysis — malicious · f5c4942ec5ebd2c5

MALICIOUS

PDF

73.6 KB Created: 2021-09-20 07:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 0067480a44c28fda3accef611b96daa6 SHA-1: 263d9f04808a69fa1977d219647a408a99fca23e SHA-256: f5c4942ec5ebd2c55a4361aea2f98a99a3e48d1610dc2edf6ee3eee24a8727b7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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 http://studiotecnicopetrillo.eu/userfiles/files/76792899724.pdf In PDF document text
- https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/rrml0dri2a574l821ttl15uvl4/25695994247.pdfIn PDF document text
- https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479c09919a6---vupaveb.pdfIn PDF document text
- https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161317a4be878e---76271590975.pdfIn PDF document text
- https://bcbc3399.com/upload/files/35181421718.pdfIn PDF document text
- https://olivier-daulte.com/ckfinder/userfiles/files/18960970743.pdfIn PDF document text
- http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e171b18db3---63747151297.pdfIn PDF document text
- http://www.focitabor.hu/userfiles/file/norepupasopikez.pdfIn PDF document text
- http://cattaneoarchitetti.it/userfiles/files/64869345183.pdfIn PDF document text
- https://badoza.net/userfiles/file/kenafipamojaxajasaxisez.pdfIn PDF document text
- http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xapate.pdfIn PDF document text
- http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/fepuvafed.pdfIn PDF document text
- http://goodfortune.hk/UpLoadFile/file///gufavo.pdfIn PDF document text
- http://mptech.vn/ckfinder/userfiles/files/gajezafesazoxulubo.pdfIn PDF document text
- https://rsebolivia.org/userfiles/file/99693205535.pdfIn PDF document text
- http://obras.ru/sites/default/files/uploads/75966251521.pdfIn PDF document text
- http://myhomeinparis.com/userfiles/files/pogotolo.pdfIn PDF document text
- https://muratay.nl/userfiles/file/futazejewovis.pdfIn PDF document text
- http://vankouwenenmastop.nl/UserFiles/file/431265000.pdfIn PDF document text
- https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/1814183b277ec3970df1d59d5a0ea4f6/58265865984.pdfIn PDF document text
- https://mmeasar.com/mmeasarfiles/file/lunakujowomexogedufe.pdfIn PDF document text
- http://www.tomasjelinek.com/img/pub/file/93853740388.pdfIn PDF document text
- http://gs-metals.com/filespath/files/20210913135216.pdfIn PDF document text
- http://seghers.kr/data/editor/file/1490128804613baec208c94.pdfIn PDF document text
- http://arcadia-fitness.es/userfiles/file/30564279104.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=m+words+that+mean+goodPDF 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_off0000bc96.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBC96	16896 bytes
SHA-256: `c2f8ca8c31d4f8824bbc9dd0e19b89a42e8170f076230bca1389a85f35c52f92`
`font_01_sfnt_off0000e858.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE858	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001006f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1006F	10636 bytes
SHA-256: `5d542ec65a7b1a39b003da6df16a567296d93fbca8d99f019a906e00018503eb`

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