PDF malware analysis — malicious · c42722c456b60747

MALICIOUS

PDF

103.7 KB Created: 2021-07-19 09:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 06b815c416ec810c0596bc76fcc68543 SHA-1: ec1c796b343c2f0152240a046d3acbe814cf4335 SHA-256: c42722c456b60747ae321718011e7ffc569f37b86cd50831b0200a3180897c66

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malware or lead users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and compromised CMS upload links further supports the conclusion that this document is part of a malicious distribution chain.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

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://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608707e56ed1c---gagiroke.pdf In PDF document text
- http://muzeumostrowiec.pl/obrazy/file/51934512964.pdfIn PDF document text
- https://dynasty888.com/image/files/20210603_195721.pdfIn PDF document text
- http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a72e02c9a09195b08166b1dfb04b0b09/92856771532.pdfIn PDF document text
- https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a7171c0f988---39820948029.pdfIn PDF document text
- http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ac6ba407c---desopulasitotukike.pdfIn PDF document text
- https://uleiuri.ro/userfiles/file/faravaxexowumixekezivafo.pdfIn PDF document text
- https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ef31f380388c0bec56b392469d7d354d/7790042174.pdfIn PDF document text
- http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160756f65065ff---1412587807.pdfIn PDF document text
- https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/j9hqsdr3eaibhi6i526t195go0/befunut.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0i8dforkkgijj5b1brtepr21g5/vefususeverepegedotif.pdfIn PDF document text
- https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f09f540be2b---20925581349.pdfIn PDF document text
- https://virker-ikke.dk/files/70009091567.pdfIn PDF document text
- https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608298d4c18f1---26230149167.pdfIn PDF document text
- https://eyetracking.pl/userfiles/file/xobaged.pdfIn PDF document text
- https://vegan-eshop.cz/data/file/jilusitiwufamapojifaxeku.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c334ca04d10.pdfIn PDF document text
- http://tatugigo.com/ckfinder/userfiles/files/nemakezovu.pdfIn PDF document text
- https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/dcb5ddc0f75a8cbe2309df4d1ef57a7f/98394343612.pdfIn PDF document text
- https://celebicatering.com/upload/ckfinder/files/bofunixejejiraxokob.pdfIn PDF document text
- http://www.asslar.de/downloads/puwulijuzowowaluxu.pdfIn PDF document text
- https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/bgu07n89b8g2088pluos8c6cc1/59004141920.pdfIn PDF document text
- https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c46e224fe---nobexeruzoteriditajige.pdfIn PDF document text
- https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/a87657527145452b617a065cfd2e17ac/20600119886.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/japo5gl4meink4t8gua4jvgrb4/wezagedaramutagojusexamaw.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=big+basket+quiz+answers+todayPDF 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_off00012cbe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12CBE	11168 bytes
SHA-256: `24d3c330c7307db99506eca10ba190762006954fdd813fdc8651216666edf064`
`font_01_sfnt_off000146ae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x146AE	19008 bytes
SHA-256: `c5806c24bb95ec905c298a149ea38d7f18a175cb2ce6d0528d243bb71dacd018`
`font_02_sfnt_off0001792b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1792B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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