PDF malware analysis — malicious · 8f4cfc8bb8d708c9

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 07:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 5c8d612b17c3e5956ca363035fca6bfc SHA-1: 056c0383e57ae4003d96030017b3c9e1077ddd81 SHA-256: 8f4cfc8bb8d708c9bcd7f895abb2e2277c66a38524719aa9b636a1d3f7059b4a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised websites, which is a common tactic for phishing or malware distribution. The presence of numerous embedded URLs pointing to potentially malicious or compromised domains supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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://hanasushichoice.com/uploads/files/77046536043.pdf In PDF document text
- https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b728f663574---zarixomosa.pdfIn PDF document text
- http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b10887b3e---devobopunor.pdfIn PDF document text
- http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/zilasibotamugerabowazo.pdfIn PDF document text
- https://tectrongim.com/uploads/files/31860929274.pdfIn PDF document text
- http://cutskytools.com/d/files/kujizedudez.pdfIn PDF document text
- https://history.tlshaa.org.tw/ckfinder/userfiles/files/tepixer.pdfIn PDF document text
- https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/f9b23886fe0cf0be491cb68082f682b9/15759199536.pdfIn PDF document text
- http://4grd.com/cmsimages/file/28671881260.pdfIn PDF document text
- https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/ff6e5f5632c6a6e757471ec02b3fd8ea/2231950819.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a39785f2c3---xuxofalatomepufelenunekin.pdfIn PDF document text
- https://kitapkaplama.com/upload/ckfinder/files/wejexo.pdfIn PDF document text
- https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094db1c8f659---77541127560.pdfIn PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080a2ce7a265---likabedovogefavasina.pdfIn PDF document text
- http://trustarshida.co/cache/fck_files/file/zilelavonavarawapugapoji.pdfIn PDF document text
- https://chmelo.hu/sites/default/files/file/vanipujisol.pdfIn PDF document text
- http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/malerinifumotus.pdfIn PDF document text
- https://twinslock.com/ckfinder/userfiles/files/potoxasekevexov.pdfIn PDF document text
- http://ajtoablakcentrum.com/_user/file/9837069298.pdfIn PDF document text
- https://bestcaps99.com/ckfinder/userfiles/files/rowesedaporidas.pdfIn PDF document text
- http://avvocatoandreabruschi.it/userfiles/files/99002547073.pdfIn PDF document text
- http://www.tramag.pl/upload/file/41390204840.pdfIn PDF document text
- http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70e07dc077---zobupatomasu.pdfIn PDF document text
- https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/43da70f54b49f50334f74b1f8169fc44/gogarugakekemekusagiposo.pdfIn PDF document text
- http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/8620401695.pdfIn PDF document text
- http://luisacortesearchitetto.it/userfiles/files/gapitojijojuzizovuli.pdfIn PDF document text
- https://bushregenerators.net/userfiles/files/fomidoriravotopiweneniles.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=osha+means+of+egress+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_off0000daa6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDAA6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f2b8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2B8	16876 bytes
SHA-256: `cf509030c6da2f9975e61d0b4e5a6013cb722187066b2e732d4210136424cbdf`
`font_02_sfnt_off00011def.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11DEF	10732 bytes
SHA-256: `c3827b8bc0990b4f25de2b6cce15d0d6bdb4e734aeb7abe2625f7516e8f04fac`

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