PDF malware analysis — malicious · 4498637a825f9bd3

MALICIOUS

PDF

87.1 KB Created: 2021-09-04 04:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 6aaa9249edbb15a24957d053baf33ac0 SHA-1: 6f5afe20f4a8d2636ba6372dbae5a88f9186f3fe SHA-256: 4498637a825f9bd3ee2d6653225431c2675712262444840f64b999b67c66eb4f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of phishing or malware distribution lures.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada48bf3e3b---fiburimuzamakosefiral.pdf In PDF document text
- https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a07c2b89444---loborit.pdfIn PDF document text
- http://streathamtaxi.com/survey/userfiles/files/65358989231.pdfIn PDF document text
- https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160765e7b5b627---30776697659.pdfIn PDF document text
- https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8bd9f0f2f---toxazomuxegegikefafosiwa.pdfIn PDF document text
- https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ededeaa34d7---67928290916.pdfIn PDF document text
- https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/4c1d10b4a6d86ead7bb8dc1121c52dc5/pujamoriseleziloxejodupox.pdfIn PDF document text
- http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/d89d5c824aa5413c45b31f7f7c44275c/48202870526.pdfIn PDF document text
- https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/7u6qqve3ufirqq8gqhk20gq9l4/95001256174.pdfIn PDF document text
- https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e0547ea8---safixej.pdfIn PDF document text
- http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/nevuwutesog.pdfIn PDF document text
- http://sun-tes.ru/files/file/bisugoxides.pdfIn PDF document text
- http://daearesort.com/FileData/ckfinder/files/20210630_8E3FA16F2C464D49.pdfIn PDF document text
- https://laughteronlineuniversity.com/images/upload/files/fisunegekawosubaridasuz.pdfIn PDF document text
- http://magooferta.pl/uploads/fck/file/vulemifagunezevug.pdfIn PDF document text
- http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d66832685b---kotawexo.pdfIn PDF document text
- https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/4bgdp3ampf50utujphtu1og9h6/kemabukesaxafibofagu.pdfIn PDF document text
- http://codienlanhminhquang.com/upload/files/vogam.pdfIn PDF document text
- http://4els.ru/uploads/images/files/87630579893.pdfIn PDF document text
- http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16085220b90d3b---39749816117.pdfIn PDF document text
- https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/3442e22582044e6d3bbe0b5f19ba97df/kunuwopurum.pdfIn PDF document text
- http://de-ko-gmbh.com/ckfinder/userfiles/files/6511747628.pdfIn PDF document text
- http://kepco-group.com/uploaded_files/userfiles/files/25251215441.pdfIn PDF document text
- https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e901e877eb---mukeguzinezono.pdfIn PDF document text
- http://casaatlantida.com/userfiles/file///zewalabune.pdfIn PDF document text
- https://hkparkkonutlari.com/image/files/nijovawuwotutarigeserar.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=purdue+owl+mla+citation+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_off0000f0af.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0AF	10800 bytes
SHA-256: `3e41f37b66f7b7215b5df01cc079ac97588040eb0472eb2b53bca027e353db02`
`font_01_sfnt_off00010991.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10991	17496 bytes
SHA-256: `8e4c6534a1d84de327c06c56833d5e775d69f6646f80fe1502370c0476d83f33`
`font_02_sfnt_off00013696.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13696	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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