PDF malware analysis — malicious · 605164ebb9814418

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 13:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: a879ab09de6715dfc51f075164e0adf3 SHA-1: 375449489ff98ec117a6e16ea8c6488152d77a83 SHA-256: 605164ebb9814418a07f25e0d860d4472a8207c3e3926a32382a4f2135f17ea5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather as a container for malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

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://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/hmsttnf3p5m7gslvhia9n8bu97/zovizejonu.pdf In PDF document text
- http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/0atog3vd2mqcdkafrje1nn879q/13059419173.pdfIn PDF document text
- https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/f3prajo184cinv0smbo8mtqgm6/xofamonapumasajejojav.pdfIn PDF document text
- http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078575aed34e---62328883072.pdfIn PDF document text
- http://zae.me/datafiles/file/9027294311.pdfIn PDF document text
- http://amexeuro.com/an3_Uploads/file/gijebulejumaruwewagotasuj.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/446ebf05347dab22fd682cc568c1081c/88925197564.pdfIn PDF document text
- http://babyindex.nl/images/uploads/49425249814.pdfIn PDF document text
- https://arichaindia.com/userfiles/file/puzusamazeximixaribarogow.pdfIn PDF document text
- https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/oh3leefubiar92j9l53smtpedr/99887113659.pdfIn PDF document text
- https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a406816a597---94259005320.pdfIn PDF document text
- https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ir9j16dcc74h71lr06ttnbpirc/49558284454.pdfIn PDF document text
- http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/057i4lsa2j7ukc5ijkcliedl81/45400657472.pdfIn PDF document text
- https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5a22620c9beb01433ccc994d6dc9615/ferenisapefekavez.pdfIn PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/f3fc4773b4d841110f69403e998e63ec/74861175696.pdfIn PDF document text
- http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3863de98db---55879295457.pdfIn PDF document text
- https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a60d0aa0251---gelojenumilebupemu.pdfIn PDF document text
- https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a97adce2ff2---39754973615.pdfIn PDF document text
- https://binarbaid.com/public_html/userfiles/file/rafewajolawevedid.pdfIn PDF document text
- https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/2140258f6bce5acc9fc0368d421de473/5393008910.pdfIn PDF document text
- http://slsnn.ru/content/file/29341192397.pdfIn PDF document text
- http://gymostrov.org/gymostrov/userfiles/file/62965110263.pdfIn PDF document text
- http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/8a2209823984af1966ffc1744e1abe1a/zuzonora.pdfIn PDF document text
- http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608723a893be7---9089779078.pdfIn PDF document text
- http://toonesk.com/upload/vuguxejabineb.pdfIn PDF document text
- http://jatyn.cn/upfiles/202105/file/1621074361.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=self+determination+aged+carePDF 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_off0000edd8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDD8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000105ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105EF	10728 bytes
SHA-256: `ced03f0c2bfbe7264b6a4f62ffed49926e4fc515362d4cd9fae5e5d1454f570c`
`font_02_sfnt_off00011e57.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E57	17052 bytes
SHA-256: `f1661c9e41a8bbbb3c04432ce41cce6e4e96c8a9ac89cefe1e127c860f84e5c3`

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