PDF malware analysis — malicious · f87fdd0a22009c37

MALICIOUS

PDF

88.1 KB Created: 2021-07-07 08:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 048529f2fbdc413da27f088aa4462aae SHA-1: 89782e373575a7a995b921adcb8ca9679ba597bd SHA-256: f87fdd0a22009c3762db4824c8d6bb9fc4d856f3b202b59493f8bcfdffd9c148

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment, indicating the document's primary function is to host and distribute links.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://archism.ru/uplcv?utm_term=what+are+the+chances+of+getting+pregnant+precum PDF link annotation
- http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160873f9e56667---2348431183.pdfIn PDF document text
- http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078603cb853c---kejagozaduvalafivasidor.pdfIn PDF document text
- https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/6d67ffb02c3cff464050db206bb1f822/vejomomodarekifupoz.pdfIn PDF document text
- http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074579316223---tedalofewetageko.pdfIn PDF document text
- http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/d11711023f2d59bbf025b3301bd776d5/85652873015.pdfIn PDF document text
- http://ilovegabal.net/fckeditor/_upload/file/98098434086.pdfIn PDF document text
- https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dac6910a432---kagesixowenidepofu.pdfIn PDF document text
- https://alihuata.com/userfiles/file/rabivep.pdfIn PDF document text
- http://growlink.biz/userfiles/file/keniwij.pdfIn PDF document text
- https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609d93aa58e08---dovumaginizunu.pdfIn PDF document text
- http://briarcliff68.com/clients/71184/File/87688316080.pdfIn PDF document text
- http://whippets-au.com/clients/7/7f/7f5032e15db821a993a8146895416847/File/18545239692.pdfIn PDF document text
- https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/jfsc3riskcj3gcphkb7uvr6kp7/jowitebawurorudizipagat.pdfIn PDF document text
- http://henri-ruch.ch/doc_pub/file/sekizi.pdfIn PDF document text
- https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/pimvj1puutab7v5d5s9udp2u01/fulanojuzigizekeradonuze.pdfIn PDF document text
- https://kontiko.com/ktkweb3/images/upload/files/53433094551.pdfIn PDF document text
- https://novahealthclinic.ca/userfiles/file/vomugela.pdfIn PDF document text
- http://vitaminyplus.eu/files/file/49940535298.pdfIn PDF document text
- https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba451e4fe8---gimeverururupef.pdfIn PDF document text
- http://getampedmag.com/ckfinder/userfiles/files/55018173329.pdfIn PDF document text
- http://laptopcuhaiphong.vn/upload/files/xebemupoxikusalusakoku.pdfIn PDF document text
- https://facades-metal.ch/ckfinder/userfiles/files/linofimuzodeto.pdfIn PDF document text
- https://dcmheavyequipment.com/admin/images/file/99585956868.pdfIn PDF document text
- http://capitolmetrophysicaltherapy.com/files/files/14485250522.pdfIn PDF document text
- http://www.tecnobor.com/ckfinder/userfiles/files/sokidopesomujurus.pdfIn PDF document text
- https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/n3bs3o3huj02i0oul4cetq0mub/fojamese.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_off0000f19c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF19C	18028 bytes
SHA-256: `c982a8a7b75c292ee6a4bfdd74d92ac07d6bf5165a0cf2dd9b3ad4a4471e3c6c`
`font_01_sfnt_off0001213a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1213A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013951.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13951	10976 bytes
SHA-256: `cd6d9271eeb7569d804d7a192081a639ce931ff479c86166e7391112648c9254`

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