PDF malware analysis — malicious · 8b2f97963c33e553

MALICIOUS

PDF

76.3 KB Created: 2021-08-12 04:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: e8893a69b1fd6a3c7c7c7d2c70a55ecc SHA-1: 9cc736451b4b4a9fecea3bfbd1dcf9a665a2c880 SHA-256: 8b2f97963c33e553a91ab47a2f33a471b10a60eb7ec580aae0e77429f888342a

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple compromised CMS upload links reinforces the malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 5

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.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96311352e9---20584515147.pdf In PDF document text
- http://wearebryants.com/clients/3/3b/3bb22ab34fb8fe691aabc4d0498f9caa/File/75249517404.pdfIn PDF document text
- https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2736f8323c---38400105969.pdfIn PDF document text
- https://chrmglobal.com/userfiles/file/wirex.pdfIn PDF document text
- http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/156bb48ghtv76u377a85dmngk4/57737684905.pdfIn PDF document text
- https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/650cf7606950e832224a05f295c96329/juvokokaxopinifudob.pdfIn PDF document text
- https://china-glass-mosaic.com/userfiles/files/20210801_001805.pdfIn PDF document text
- https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/1c33f555667f6add3574786566c9393c/vodojip.pdfIn PDF document text
- http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2fa7a2106---12057299842.pdfIn PDF document text
- https://textosolutionslinguistiques.ca/upload/editor/file/ralemimukipepasamegireze.pdfIn PDF document text
- http://turskazka.ru/ckfinder/userfiles/files/81325265521.pdfIn PDF document text
- http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fad58b452---78352701721.pdfIn PDF document text
- http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1be461ec36---woxumetemifaseviviweroriw.pdfIn PDF document text
- https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe6798bbc---lodubevapu.pdfIn PDF document text
- http://terminal.hr/userfiles/file/bilipaxanabasezil.pdfIn PDF document text
- http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4ec3a9743---7667992762.pdfIn PDF document text
- http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/2919170362.pdfIn PDF document text
- http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/90379686829.pdfIn PDF document text
- http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4886a5b28---pesozeritirorezixuvogod.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16103046e95645---karumuxaxebilirijawa.pdfIn PDF document text
- http://airsoft1.ro/files/file/betadenupukufotipowepa.pdfIn PDF document text
- https://bancodevida.com/bancodevida/admin/images/image/file/14226974719.pdfIn PDF document text
- https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/b81ad16a2ad7eb5c2621165462b73cec/tixidozofozevedomijulop.pdfIn PDF document text
- https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/ejfts3fo76km7c6e29mqbj15q5/voxategeladizofud.pdfIn PDF document text
- http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3ebb7e0c6---bafeliw.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=carrier+infinity+system+control+manualPDF 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_off0000c837.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC837	16428 bytes
SHA-256: `82ba3f39ada265b9e646d9b44199a95ad783dd522d52f5161c4a16c2a34b722c`
`font_01_sfnt_off0000f28f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF28F	10740 bytes
SHA-256: `1b80b907227d50612398947d556f9e4aed2e847dce753ac7890d67977d89cc28`
`font_02_sfnt_off00010b52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B52	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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