PDF malware analysis — malicious · fb101b978d58d7ef

MALICIOUS

PDF

83.8 KB Created: 2021-09-03 07:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 07944cc458e19cfeb2a812dfa8524e87 SHA-1: 472bc3753fe3041c7c00a5cbb9e2922175cbc41c SHA-256: fb101b978d58d7ef3eb8e958af3c6fd5b59458fb64e2b810c5a0b8e0cee48993

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains, likely intended to redirect users to malicious content. The presence of multiple links on potentially compromised or disposable hosting increases the risk of users being led to harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://plswa.com/wp-content/plugins/super-forms/uploads/php/files/747bf42caee44c0180ae2b67ec5871b2/fuwupaxaxefige.pdf In PDF document text
- http://hnspkjx.com/d/files/88942827867.pdfIn PDF document text
- https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdd284128e---bupujepujilipus.pdfIn PDF document text
- http://norilskgu.ru/userfiles/file/98101226555.pdfIn PDF document text
- http://elhammagazine.com/ckfinder/userfiles/files/narivinajefawufafil.pdfIn PDF document text
- http://barcabianca.eu/upload/file/58664942157.pdfIn PDF document text
- http://dagmare.de/userfiles/file/jeron.pdfIn PDF document text
- https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/4cfaaf2bc2a5587a7fb89239118376cf/dolesatozefikegop.pdfIn PDF document text
- http://arslanemlak.come/file/64121719851.pdfIn PDF document text
- https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/64c00793c7b0c109ce7b2c9cead01d95/kirenowigatarenenima.pdfIn PDF document text
- https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f644505a4---vejodogewifoxag.pdfIn PDF document text
- http://worldtile.net/jangheung/userfiles/file/56924726514.pdfIn PDF document text
- https://bushregenerators.net/userfiles/files/mexivofadazapugebi.pdfIn PDF document text
- https://autoprofi.ua/userfiles/file/jobamaguwosuxu.pdfIn PDF document text
- http://yuhao-tech.com/userfiles/file/kafufogejufupokutolanaz.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6719087e2---80579679398.pdfIn PDF document text
- http://esipro.fr/userfiles/file/jupifimiwipeles.pdfIn PDF document text
- https://europartner2.pl/uploads/89757759480.pdfIn PDF document text
- https://pestresolution.pt/site/upload/file/87480079340.pdfIn PDF document text
- https://galerieportelouise.be/userfiles/files/3278315726.pdfIn PDF document text
- http://sowa-architekci.pl/userfiles/files/vunukel.pdfIn PDF document text
- https://rasathantrananotech.com/ckfinder/userfiles/files/59606667766.pdfIn PDF document text
- https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/4c7c60d73c916ec0cf8dbeaa13f733b5/movefafupujaves.pdfIn PDF document text
- http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f230a3a1e6---veweg.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=hemoglobina+glicosilada+diabetes+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_off0000e457.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE457	16868 bytes
SHA-256: `d64394e841e396895ff3cf658a2e95f5ad23bcf1bdab43897baec44e39cc09ef`
`font_01_sfnt_off0001100a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1100A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012821.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12821	10996 bytes
SHA-256: `52db65bbc0729be5ff26228ac96956d40f2823213142e1ee717a50b15fe34f88`

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