PDF malware analysis — malicious · 9051f5a2911ff7d9

MALICIOUS

PDF

88.1 KB Created: 2021-06-29 06:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: b4bbfd4fc4fdc3f797406b5e8ee7b2d3 SHA-1: 6f92853b354d04e88c9bc89472ced177f1d8fce7 SHA-256: 9051f5a2911ff7d9440cfcb9e9e586f4bec0c8698f20dd9e5a2c4f8ec2faa98f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content. No scripts were extracted, but the presence of a link farm strongly suggests a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://drafthe.ru/uplcv?utm_term=positive+working+attitude PDF link annotation
- https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609863f5066ce---86570396548.pdfIn PDF document text
- https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b591c02507---xaparajizoret.pdfIn PDF document text
- https://sinarwaja.com/account/files/zuraralitamuwaruvadod.pdfIn PDF document text
- https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/kk8mscfpr57j1n2i2v40nskpiu/23829060445.pdfIn PDF document text
- http://cnex.cc/images/blog//file/71182971214.pdfIn PDF document text
- http://hilltop1976.com/clients/24685/File/xalixagezagemanekorowe.pdfIn PDF document text
- http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608515b42892b---bovokotonopuvomozu.pdfIn PDF document text
- http://richmediahouse.com/admin/uploads/file/fakofolebudulupulira.pdfIn PDF document text
- https://giorgiosantinelli.it/file/bagusoxuf.pdfIn PDF document text
- http://dfh-consulting.com/userfiles/file/rajuwa.pdfIn PDF document text
- https://dimensioninteractive.com/WYSIWYGImage/file/duwelo.pdfIn PDF document text
- https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e77f0a929152153687e1840244f00828/fogob.pdfIn PDF document text
- http://tuning-zone.eu/userfiles/file/sexil.pdfIn PDF document text
- http://cuacuonanbinh.com/userfiles/file/naxevuremur.pdfIn PDF document text
- https://securityguardsupply.org/php/uploads/file/gawasevudu.pdfIn PDF document text
- http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080caca8bce0---12017122991.pdfIn PDF document text
- http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5346591779---tagosatoju.pdfIn PDF document text
- https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/il0jpu11hng1ffsnomc40eh9ie/banusimigolokudoxu.pdfIn PDF document text
- http://4x4autok.hu/userfiles/files/sowepex.pdfIn PDF document text
- https://bestofbucerias.com/upload/file/64883871052.pdfIn PDF document text
- https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b587e13e4d---18582335050.pdfIn PDF document text
- http://georgekoldun.com/var/upload/file/radotasam.pdfIn PDF document text
- http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f085e603d---dafenafafasijaluvijojes.pdfIn PDF document text
- https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878dff167f6---40222338918.pdfIn PDF document text
- http://newtarrytowndeli.com/uploads/files/mapejoxodoxiwudorilefika.pdfIn PDF document text
- https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/b2ce237fd2721d1f35f876922f502176/zopitibigevoxipewad.pdfIn PDF document text
- http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b46647042ef---95343811579.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_off0000f174.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF174	10720 bytes
SHA-256: `47bfcae92774f7df23b6fb6bf16cc5f99e6444b9da9dbd7fe30bbf3fe70b58f4`
`font_01_sfnt_off00010a21.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A21	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012233.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12233	20308 bytes
SHA-256: `46efbc82eef5888419b87852c748af70103d0be06f68fb4f7d83430e39f0b8ad`

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