PDF malware analysis — malicious · b0df5b8529c7e841

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 15:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: dd79ddfa1fd72544c9c9350f079b21aa SHA-1: d80b325bfccf2536d61d13b3552f796bbd37f8df SHA-256: b0df5b8529c7e8417f6e12f9a2dd84192a8aff93e28520fda70105e485904d25

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a tactic to distribute malicious content through seemingly legitimate but compromised infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or phishing content.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608e163963b84---36036432565.pdf In PDF document text
- http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/f9d4cb00af31eddfde5f9b6ebcbec796/28365081471.pdfIn PDF document text
- http://www.multigacos.com/admin/uploaded/fck/file/xavizesirotuzixijuzu.pdfIn PDF document text
- https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ldgibc3g236523qqlfst16i811/rubolepub.pdfIn PDF document text
- https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7be5446dde75af00542c1f859c220d07/51388748482.pdfIn PDF document text
- http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2df10e5dd---6471284131.pdfIn PDF document text
- http://aexpress.lv/index/images/up/file/vetijifodufobemoladi.pdfIn PDF document text
- https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/21e0682303ca2c49220aa1ff70c51a25/jafuxesipuxilulixedep.pdfIn PDF document text
- http://missinternationalbeauty.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/ferixijorinabimogetarak.pdfIn PDF document text
- http://passaicvalleyclassof1957.com/clients/44362/File/bisitafimomeforixipo.pdfIn PDF document text
- https://mk-promotions.com/ckfinder/userfiles/files/xinilaz.pdfIn PDF document text
- https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/22b74dc81bcf8d6d8efb67a8424ad750/96231257554.pdfIn PDF document text
- http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ade566bdf7---18465999879.pdfIn PDF document text
- https://beytarimcilik.com/admin/editor_resim/file/kenatekemet.pdfIn PDF document text
- https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5897d049aa---54565861306.pdfIn PDF document text
- https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e8ce2f3f9---75877424896.pdfIn PDF document text
- http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2a30721e9---mitesujevebomebusip.pdfIn PDF document text
- https://handinhand-daycare.com/ckfinder/userfiles/files/23909731203.pdfIn PDF document text
- http://yds-wcv.jp/free_images/files/36042038677.pdfIn PDF document text
- https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/1fc85cbc228dc6e5cf6f110d5f0a3026/bikumo.pdfIn PDF document text
- https://computerzone.pk/file/34591427789.pdfIn PDF document text
- http://paradisoseminatrici.it/userfiles/files/losepodisumubalixogimotu.pdfIn PDF document text
- http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160733eee6bbc4---3475948330.pdfIn PDF document text
- https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/bom1b32d815lomddgmsclv659q/sagepuzok.pdfIn PDF document text
- http://beijingbeat.com/contents//files/44814692691.pdfIn PDF document text
- https://underworldgear.com/upload/users/files/fidotuwimizosel.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=machine+learning+the+new+ai+pdf+downloadPDF 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_off0000e0d9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0D9	18024 bytes
SHA-256: `73dc5ebfd63b9e2a83d5464494aad5423128ad7c79f558ecef3d5a9c4f7450cf`
`font_01_sfnt_off00011043.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11043	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001285a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1285A	10812 bytes
SHA-256: `28d5a6935e705d3bd26c8b10eed3d4fd46cd97273827e40e418f0ea5c01dadbc`

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