PDF malware analysis — malicious · 3156501eaf1e4e8d

MALICIOUS

PDF

86.4 KB Created: 2021-07-03 14:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 1683a1d2bac2402d513a78db415c0c85 SHA-1: af37a99d33d19445e12c7c089a324032a8334968 SHA-256: 3156501eaf1e4e8d026462e8595db153be85fc2ea81725896c9c1bd6d7e3ddf1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. No scripts were extracted from this sample, but the structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/6hh5c459nnh7l4qin8ooce5oo0/xiwaz.pdf In PDF document text
- https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/6e1350a09b7f8c471d944428f2d1575c/joxafagagilareluzulog.pdfIn PDF document text
- http://cheumst.com/upload/fckeditor/file/povupapotumuvoderuxujikov.pdfIn PDF document text
- https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/5de2d0e81e7c2b913a32067214dd7867/zosuwap.pdfIn PDF document text
- https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/841c1697d851c7ea0953fbd68b9a3e72/mawupovowimutubexoxifut.pdfIn PDF document text
- http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/lhkg1g6lg2t0d0nma3je558j0v/nebulutavezuzexo.pdfIn PDF document text
- http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/kri45j7vi9kccr0trmo056mbv4/zejamuniruja.pdfIn PDF document text
- https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/14c53ed171c02f0c8d351243df796964/gunaj.pdfIn PDF document text
- https://weddingitaly.jp/images/file/jesolabuvomavelitisokimib.pdfIn PDF document text
- https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/098sjgje3nk36rbkki4ijtkehu/jaregoliseta.pdfIn PDF document text
- https://hirurgija.me//files/6196292544.pdfIn PDF document text
- http://cropscipublisher.com/files/upfiles/file/3211591078.pdfIn PDF document text
- http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/5ple36p90snetm32476dj6l0l5/mekifen.pdfIn PDF document text
- https://cafesca.org/ckfinder/userfiles/files/28289578620.pdfIn PDF document text
- http://am-assets.com/aom/magnolia/userfiles/file/sulujomujuvobijux.pdfIn PDF document text
- http://valeneighbors.com/userimages/93237679573.pdfIn PDF document text
- https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cd5c5f2e3---77575969315.pdfIn PDF document text
- http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bfbab5591---17444244696.pdfIn PDF document text
- http://vivaibonomo.it/userfiles/files/fapolarobuborupomikubo.pdfIn PDF document text
- http://nickels.design/ckfinder/userfiles/files/riteni.pdfIn PDF document text
- http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070968e7886e---66097769618.pdfIn PDF document text
- http://antansconstructions.com/ckfinder/userfiles/files/27621296503.pdfIn PDF document text
- https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c15cda051bb---mokolapojagokijugulobaz.pdfIn PDF document text
- https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094c8386449d---jemilif.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=liift4+chest+and+tricepsPDF 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_off0000f0b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0B6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000108c8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108C8	16704 bytes
SHA-256: `00f600e3223e98fe0a1f83d573c28b7df9d2c106daafed29d41ad54c4ad2a4d6`
`font_02_sfnt_off0001342a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1342A	10588 bytes
SHA-256: `fb9d3cf9dfe417c1b9e2ac611d3955e982e82e537dba9d18b8d4028a8bb2b12a`

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