PDF malware analysis — malicious · f8722c35db5949b8

MALICIOUS

PDF

88.3 KB Created: 2021-07-23 19:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 1de99683154eaae3c1ffcaa8ced0e85b SHA-1: 9ef9617d5bc4f5b0955e92fb4e7357bd38a22fe6 SHA-256: f8722c35db5949b87d3e56f6a1c725fe418c98aeb2c27d62bd4dfdd1dba3766c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to compromised websites, many of which are WordPress installations utilizing vulnerable form plugins. These links are designed to lure users into downloading further malicious content, as indicated by the ClamAV detection and ML classifier flagging it as a phishing trojan. The structure suggests an attempt to distribute malware through a link farm.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

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://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793b8849805---6744122140.pdf In PDF document text
- https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf31de0434---94964262595.pdfIn PDF document text
- https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/aapv6padboteasg65o6rk5cv1l/nejoraxerap.pdfIn PDF document text
- https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e63aa12d6---duketoje.pdfIn PDF document text
- http://sys-svinding.dk/userfiles/file/xupijus.pdfIn PDF document text
- https://makiriaszto.hu/ckfinder/userfiles/files/31988854715.pdfIn PDF document text
- https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/lo7qd3q49rcotct563juupl4s6/53170690774.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f521312a3f---xakegitimaro.pdfIn PDF document text
- https://besteva.com/upload/files/gokijuzatozotukobevedigef.pdfIn PDF document text
- http://suphammamnon.org/uploads/files/voxuxujo.pdfIn PDF document text
- https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/qc25ebvhito7sab206ie62ak6h/20183163019.pdfIn PDF document text
- https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16092554649427---42022294210.pdfIn PDF document text
- http://maslag.eu/userfiles/file/wanenib.pdfIn PDF document text
- http://jhroseclassof77.com/clients/45984/File/zesepenerojawi.pdfIn PDF document text
- https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/61519619045.pdfIn PDF document text
- http://abwplazaview.com/uploads/files/wifabuwusadabudasa.pdfIn PDF document text
- https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c06b96d6---ginibavolibojemuxosolaf.pdfIn PDF document text
- https://pathakpharma.in/singhania/downloads/file/45918715973.pdfIn PDF document text
- https://brahmagnanam.org/fck_uploads/file/jigadubisega.pdfIn PDF document text
- http://barsugo.com/ckfinder/userfiles/files/9287619168.pdfIn PDF document text
- https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/iobe1hls29615lmlfcn8tbk9ht/ratibabapepubajetovona.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d18e4427034---1450542168.pdfIn PDF document text
- http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747bb08feb8---kegeteweris.pdfIn PDF document text
- http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/d31b99b66599f0dd7d35497b3139e75a/mefebowamumixoliwa.pdfIn PDF document text
- http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/sijosikule.pdfIn PDF document text
- http://aeronautike.com/userfiles/file/6580236067.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=statistics+informed+decisions+using+data+6th+editionPDF 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_off0000f3e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3E5	16852 bytes
SHA-256: `1bb5bf92e5d765244c4add26de89bf9878d16ea8489260d913870108755da9bb`
`font_01_sfnt_off00011fe4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FE4	11220 bytes
SHA-256: `3d16474e115e823d5c9d00f82601cf032e766e5b1cc2ade34272aaf93cb24abf`
`font_02_sfnt_off000139cc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x139CC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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