PDF malware analysis — malicious · 80d0ed41a9de6040

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 03:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 35ab5ef370fb30478ad6c9ee3822cb95 SHA-1: 7080e7916b970902908e2e50ca605a2217f44793 SHA-256: 80d0ed41a9de6040776aacb40a4091b767063eef07f5d5d2b74fab272a923554

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=understanding+quadratic+functions PDF link annotation
- https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1614085cd3df37---9133987566.pdfIn PDF document text
- https://newsale.linyn.mobi/upload/ckeditor/pages/files/bamiminalajebedabugo.pdfIn PDF document text
- https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/xumuravusogevirusazemize.pdfIn PDF document text
- https://hbphoto.ca/resimler/files/mageno.pdfIn PDF document text
- http://oresteruggiero.com/userfiles/files/74726180089.pdfIn PDF document text
- http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/bezupokeraxew.pdfIn PDF document text
- https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/xifosagemepabigofe.pdfIn PDF document text
- http://giaodantanthaison.com/Images_upload/files/1137390081.pdfIn PDF document text
- https://rybczewice.pl/userfiles/file/84361275303.pdfIn PDF document text
- http://rabotatver.ru/userfiles/admin/visuwilekafimapofuj.pdfIn PDF document text
- https://sibservis.com/ckfinder/userfiles/files/43936689820.pdfIn PDF document text
- http://ihanzao.com/userfiles/file/20210914001008_1550732845.pdfIn PDF document text
- http://www.pattyn360.com/upload/forum/files/87674084572.pdfIn PDF document text
- http://bestpokeya.com/uploads/files/tufiwizoromakusali.pdfIn PDF document text
- https://derechosenred.org/aym_image/files/36330296690.pdfIn PDF document text
- http://lordwood.ru/images/file/sifitiji.pdfIn PDF document text
- https://darkoyunpin.com/calisma2/files/uploads/manogifufanuboladotawal.pdfIn PDF document text
- http://9y.bfage.com/upload/files/20210901233819.pdfIn PDF document text
- http://gsemilia.it/userfiles/files/34774539472.pdfIn PDF document text
- http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161423a52a0273---61826634670.pdfIn PDF document text
- https://vipbeachhouse.com/uploads/editor/file/lafisamukaropeturuzunimul.pdfIn PDF document text
- http://dar-tom.pl/userfiles/file/71654249084.pdfIn PDF document text
- https://indirimlipin.com/calisma2/files/uploads/dexuwepuxogolebaw.pdfIn PDF document text
- http://dichvuhieuchuan.com/upload/files/gafosuxavogewof.pdfIn PDF document text
- https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/c4219169603dc47a63c3029e66e09d93/92764245476.pdfIn PDF document text
- 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_off0000b41b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB41B	14408 bytes
SHA-256: `c5465580275f466e3edec512852455ee9478d8663ce847ee235deeb81c9078b6`
`font_01_sfnt_off0000d7db.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7DB	10856 bytes
SHA-256: `f4f6591447754ac4d155e7e3bbd4e20deb52cb85aaf6b03c5da77dc9fef861f0`
`font_02_sfnt_off0000f08e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF08E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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