PDF malware analysis — malicious · 2724387e79c730a0

MALICIOUS

PDF

91.1 KB Created: 2021-08-22 06:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: a2a1353ab90bd47c91c213e3e57f8f4a SHA-1: d3fe291d20f30514653d02546798c877f79eaf8b SHA-256: 2724387e79c730a053c0e06a2f53dee40651b379475390a08fd9ac5048317c70

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan distribution vehicle. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or to download further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9933

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=ejercicios+resueltos+de+estequiometria+basica+pdf PDF link annotation
- http://nenkin-t.com/upload_img/ck/files/88801303067.pdfIn PDF document text
- https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/be2d4ee76a7dc805ac79dbe25590baf7/71518260982.pdfIn PDF document text
- http://csc0311.com/userfiles/file/20210703151954_se3gmc.pdfIn PDF document text
- http://synthecinter.com/userfiles/files/zefuvupamebuwizefevemogon.pdfIn PDF document text
- http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c4b8b3275---81291702377.pdfIn PDF document text
- http://anpo.vn/upload/files/timeroleguguraxizade.pdfIn PDF document text
- http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/pebenewulexulow.pdfIn PDF document text
- https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/804c314b4bb79eaee9d1b6126e94109f/22683963331.pdfIn PDF document text
- http://amdind.com/userfiles/file/35744877626.pdfIn PDF document text
- https://coebmsf.com/userfiles/file/wunuga.pdfIn PDF document text
- https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/0ukc4oqj7ph606qqh5dogg6sva/wajixipimig.pdfIn PDF document text
- http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c9a3a06c---29614174526.pdfIn PDF document text
- https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/bd97f0e9e830119c86f031ad7dec48f1/30725595740.pdfIn PDF document text
- https://ratco-hardware.com/Ups/files/pabawolilifupife.pdfIn PDF document text
- http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mikifosudokuveliden.pdfIn PDF document text
- https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/4e45196e8b1514f8c4477f502a94bd23/54917574770.pdfIn PDF document text
- http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/51aaf35a365c5805ad2c17d8f0a669af/solidenorebozi.pdfIn PDF document text
- http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160864a228b67e---fukabajisa.pdfIn PDF document text
- https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd3eb4451e---51068931845.pdfIn PDF document text
- http://medica-eg.com/userfiles/file/99167902521.pdfIn PDF document text
- http://www.espace-hotelier.com/ckfinder/userfiles/files/95576245033.pdfIn PDF document text
- http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f846a355c16---2936104903.pdfIn PDF document text
- http://symbioticlifetech.org/attfile/fckimg/file///2021051719378_305831723.pdfIn PDF document text
- http://esoftland.com/userfiles/file/jeveborafolero.pdfIn PDF document text
- https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83ea5d54b5---joxop.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e61e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE61E	17744 bytes
SHA-256: `e18c9220c9d11237d7f539ba54619a643e4948624167584cf029a24ee7ac99b6`
`font_01_sfnt_off0001132a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1132A	16168 bytes
SHA-256: `1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68`
`font_02_sfnt_off000128c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128C6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off000140dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x140DD	11176 bytes
SHA-256: `d2603559778fbe80e776d01bfa7b9adf58d35b44898c531ebd7bf786f5261b53`

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