PDF malware analysis — malicious · 59cb7a1bcfa71606

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 22:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 64b1c5b3d52ce7e2d117c7da6a0da637 SHA-1: 350aa07304370fb2cb2610ce6474fb492cb80a30 SHA-256: 59cb7a1bcfa71606eaa6fb28ef9250f849bc44395a173cf3ddcacd1ef49c4ab6

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 a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://synerhu.ru/uplcv?utm_term=entry+level+project+manager+resume+pdf PDF link annotation
- http://zrdb-drogbud.pl/Upload/file/sesudipebetiw.pdfIn PDF document text
- https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xelenirujobenuger.pdfIn PDF document text
- https://mauspro.net/upload/files/94569619936.pdfIn PDF document text
- http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070b79461614---62674432540.pdfIn PDF document text
- https://marcuspietrek.de/MARCUS/files/file/vexofumenekunile.pdfIn PDF document text
- https://stbenedikt.ch/userfiles/files/mapidaniwubuvebavoraz.pdfIn PDF document text
- https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/cd5aef26780fe05ef6f6567a71b38522/pevasomadegiketovuge.pdfIn PDF document text
- http://onlinepravenconsultant.com/uploads/wysiwyg/files/7365641864.pdfIn PDF document text
- http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/4a488c5e99484eaf21760923a25f1666/24796044752.pdfIn PDF document text
- https://milsagliksen.org/upload/ckfinder/files/pakudinisebiwori.pdfIn PDF document text
- http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1c5442a37---subuvixusedaxoledatixofu.pdfIn PDF document text
- https://www.multilandtours.com/assets/ckfinder/userfiles/files/58883515880.pdfIn PDF document text
- https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/f667422cc389a8786ef52b79a733e302/60464406182.pdfIn PDF document text
- http://www.aportecnica.com/imagenes/editor/file/tafutosupas.pdfIn PDF document text
- https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/6040369813f0479f9bb0980512d5c14e/53206640811.pdfIn PDF document text
- http://iphonedown.com/ckfinder/userfiles/files/36389397462.pdfIn PDF document text
- https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/blndnn8c8cncvdll7pjg4i9oua/ropavu.pdfIn PDF document text
- https://doellefjelde-mussemarked.dk/images/newsmail/file/4219449475.pdfIn PDF document text
- https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/96c6a06792c66cc3f74d6ed1489ff745/32939212268.pdfIn PDF document text
- http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705c3107843---31494669127.pdfIn PDF document text
- https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a4424b622---jemuriwawubetodixepo.pdfIn PDF document text
- http://www.casasemio.com.br/ckfinder/userfiles/files/95267623976.pdfIn PDF document text
- http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608523d9b979b---jipuvovevupomabofi.pdfIn PDF document text
- https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d31d8d4b709eac3c4b97881449232004/guvugaxelusitenobosabo.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_off0000ddf4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDF4	16736 bytes
SHA-256: `7700ad3a62102fe3e0678adb7a05968cf85b6be17679e79dbc346ff30c19760d`
`font_01_sfnt_off0001097b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1097B	11264 bytes
SHA-256: `415dcf76f92c5ed9c3f77fc5dac44c0be481c4c6bea511a1c7bb61e6f1d00078`
`font_02_sfnt_off000123c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123C6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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