PDF malware analysis — malicious · d1f3d4d194c616ad

MALICIOUS

PDF

75.9 KB Created: 2021-09-05 20:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 7a7ef229eebb9304fa96a952f0003811 SHA-1: bd3d8b7a6cdc2026655be3d0bb926d35c885eaad SHA-256: d1f3d4d194c616ad9e37df728ff834960b5bf59557474c75701c5d6bdd29e510

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. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics suggest it is designed to exploit user trust by appearing as a legitimate document while leading to harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=super+lectura+veloz+carlos+quiroga+pdf PDF link annotation
- https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/38d7ae3dc8215da30348cabb03c39d46/12341863391.pdfIn PDF document text
- https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c658adfb7---66709001190.pdfIn PDF document text
- https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff5fcbccd4---88562982663.pdfIn PDF document text
- http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707f824b1b7---nikaxuwegebiwamuleseg.pdfIn PDF document text
- https://trvstore.com/userfiles/file/koweb.pdfIn PDF document text
- http://files.ibiza-ferien.de/file/3155530397.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb1b284a9e---93948058721.pdfIn PDF document text
- http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607983ce31f51---kudedu.pdfIn PDF document text
- http://thuonghieutoancau.vn/uploads/files/tinib.pdfIn PDF document text
- http://parisplaza.net/clients/3/35/3561a7ce45da2f2f114a98ea6175a4b1/File/wobotadokoraruwojisuze.pdfIn PDF document text
- http://cybernet.asia/UserFiles/File/78278192077.pdfIn PDF document text
- http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fb32d9ddb---72683740090.pdfIn PDF document text
- http://areaengineeringsrl.eu/userfiles/files/54334489721.pdfIn PDF document text
- http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ad1d650b1---baravananewagalisoviwim.pdfIn PDF document text
- https://cncostruzioni.com/userfiles/file/gezusexezovijaniruzozew.pdfIn PDF document text
- http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/nunujimazedowomodadarugo.pdfIn PDF document text
- http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f640dce87982055eb62ca423cf510df4/fozazozi.pdfIn PDF document text
- https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/73ace5359cdeb1ac3fcb30ffe8f44e6c/6513985873.pdfIn PDF document text
- https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b874f33ce2---39341435016.pdfIn PDF document text
- https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609170d3ae0e3---dorolek.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c10899d2cc79c423a6351992fc687ef6/jekisagaroka.pdfIn PDF document text
- http://www.synagoge-stommeln.de/ckfinder/userfiles/files/zoniwiginupi.pdfIn PDF document text
- http://alexdisinfestazioni.com/userfiles/files/rakupavije.pdfIn PDF document text
- https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/5d6eafb91800fdd36f336152a7d56f83/kubewuwufojojuxa.pdfIn PDF document text
- https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160d643219c87d---xarapa.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_off0000c0cf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC0CF	18536 bytes
SHA-256: `1519d4ffe7facc02a691d3d9ba5aecb6540dcc801910285dbca1472d96b3f173`
`font_01_sfnt_off0000efa1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFA1	11140 bytes
SHA-256: `0e6f73aa08dc66f41335eb53bbc4b3660bd17a4d66cda91d595a4e5911f08c0f`
`font_02_sfnt_off0001094b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1094B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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