PDF malware analysis — malicious · 718f9fef0927758e

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 08:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: f041d73d315908bd2b66eac02062dbc1 SHA-1: f926e4f9aeb7ca15c97636c59299ffbdf31e02d6 SHA-256: 718f9fef0927758e47c4b854c36319ccce292c7563cc274d463246a967cd75fe

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites, many of which host further PDF files, suggesting a link farm or redirection mechanism. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/abd7da7fa86cf1607acecdbaf956efb3/kavemubiximazejajukele.pdf In PDF document text
- http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aff4673d19---povokonawuvapo.pdfIn PDF document text
- http://gfzgt.ch/upload/file/62994799495.pdfIn PDF document text
- https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/36952535131.pdfIn PDF document text
- https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/8808ee17fcd1ede3ffaf05328f80aeb4/kinefizepimalozevin.pdfIn PDF document text
- https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/aa9ab25d9c1a27f563b593ccbd36c5ef/subuzexojitopewozupigafit.pdfIn PDF document text
- https://smobiil.eu/userfiles/files/mewomuvupejetefudezona.pdfIn PDF document text
- https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/59462946188.pdfIn PDF document text
- https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68bdeb3f27---28485465214.pdfIn PDF document text
- https://cargoservice.pl/cargoservice/userfiles/file/67332946575.pdfIn PDF document text
- http://hoitruyengiaocodocvietnam.com/uploads/image/files/52658191470.pdfIn PDF document text
- http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082b80d6eda9---44498524215.pdfIn PDF document text
- https://spotiverify.com/ci/userfiles/files/99612509968.pdfIn PDF document text
- https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/3485a7159670c512e93aaec7b03db7b5/7767049088.pdfIn PDF document text
- http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f0419f9d8---wavuwibofuvonalam.pdfIn PDF document text
- http://tandartsindex.nl/images/uploads/nusejukejelarexinogapifu.pdfIn PDF document text
- http://zonazero.es/userfiles/file/19346738839.pdfIn PDF document text
- https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/26d00a50f04a8ceb5381deb4632e558e/sitopafivategowe.pdfIn PDF document text
- https://b2b-intelligence.it/uploads/file/56877368769.pdfIn PDF document text
- http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ucq5u5a1iibkmrqqip7t34sg95/direfafeloxokuzexejogiso.pdfIn PDF document text
- http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/79102991241.pdfIn PDF document text
- http://congtydaihai.com/upload/files/39896605176.pdfIn PDF document text
- https://cooperspick.com/files/dewanepozisexasareno.pdfIn PDF document text
- http://minuspk.ru/minuspk.ru/userfiles/file/pevenomilosubolodowen.pdfIn PDF document text
- https://jingchengs.com/jingchengs/ckfinder/files/20210905105128.pdfIn PDF document text
- https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/cf812a342a8a2b72a41667b549d7f822/65380095831.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=partnership+in+business+pdfPDF 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_off0000df4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF4D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f75f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF75F	17856 bytes
SHA-256: `29611fbfb06ea648bccb2aaad68d3b5e654b5db0d91269d7d5700adc2c5f4bc5`
`font_02_sfnt_off000125da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125DA	10672 bytes
SHA-256: `2050e25930f74800a34750fffacb18821d4862379abcb040ab24c500880936c0`

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