PDF malware analysis — malicious · d28e71fa5fd1799a

MALICIOUS

PDF

90.5 KB Created: 2021-08-31 02:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 560d856510b3bdfa3c6f4f16cb5406b3 SHA-1: c4cfa122dcd1cb28959029ef3af4b7ff7b6366d4 SHA-256: d28e71fa5fd1799a61bc5407708ec56dc90ee194c0b1931fae7afa9b56f7fce0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The presence of multiple distinct hosts and link farms indicates a broad attempt to leverage compromised infrastructure for distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9937

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e06d040d2cafd7cfe153ba07d74c4972/sesizaxaxinaxag.pdf In PDF document text
- https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/144a62bf9e6be0b03666259173738442/14721845332.pdfIn PDF document text
- https://coonvalleycc.com/userfiles/file/5064615144.pdfIn PDF document text
- https://bienenaktuell.com/sites/bienenaktuell.com/files/file/wezuwigaxenebibixepelawuz.pdfIn PDF document text
- http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079c4d4330c4---78725286729.pdfIn PDF document text
- http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607578961a84a---61413517351.pdfIn PDF document text
- http://cmrivestimenti.com/userfiles/files/vafejuramubipa.pdfIn PDF document text
- https://eastmanllc.com/ckfinder/userfiles/files/tonisu.pdfIn PDF document text
- https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/06a3080a3ba0f097c86c8cff7002d9aa/21426637380.pdfIn PDF document text
- https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93840176fe---wabowasadopexevizakaz.pdfIn PDF document text
- https://clumba-indoor.ru/files/files/24026320350.pdfIn PDF document text
- https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/61h7ejh6r7lvqsju32k3in0usm/lotojewepezafegofar.pdfIn PDF document text
- https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/23ee1c3c3908e525bf65aff977a152eb/25970895736.pdfIn PDF document text
- https://grupahatak.pl/admin/_fck_files/file/95279088518.pdfIn PDF document text
- http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdf8a699c7---zunowi.pdfIn PDF document text
- http://hz-karavany.cz/ckfinder/userfiles/files/53187421273.pdfIn PDF document text
- http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/2bo166bsiu0925c22333vl4sh6/wabirasolosefomu.pdfIn PDF document text
- http://gpmpoolandspa.com/ckfinder/userfiles/files/zamaxixegepazimo.pdfIn PDF document text
- https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/5d28bb7cb95331203e7815c6ec3e344c/wulotetilomodunejamazeb.pdfIn PDF document text
- http://www.dfdtrading.sk/ckfinder/userfiles/files/wukafevutamedubeb.pdfIn PDF document text
- https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/b3rk26lrddlom1v01cckvst5k1/8726849797.pdfIn PDF document text
- https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c1e6027e2524d3396a26af466f2abc11/2400257565.pdfIn PDF document text
- https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/b8005597b6299f175d5a9a091733a360/jerumajoxonegurodexig.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=best+dance+group+on+america%27s+got+talent+2019PDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_003_off0000dd16.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xDD16	18360 bytes
SHA-256: `fe6a030cce3a1e6f7bc0bd98ffaf71e5932d07356b5efb165c677cd9129ebadd`
`font_01_sfnt_off0000f965.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF965	11504 bytes
SHA-256: `846666586b869830f1bea8a03c6388667a5ff65e7b401a7dd8c23a96eaf846cc`
`font_02_sfnt_off0001148b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1148B	17924 bytes
SHA-256: `745fa364203d85ecbc5957d4d2d40d4ff27f48f2329329dc2c1e37872303a077`
`font_03_sfnt_off0001432d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1432D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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