PDF malware analysis — malicious · 58e51757070e9f0b

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 04:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02

MD5: 1edfc118afc0e8e940c86a69d5581625 SHA-1: b8ecf8e03db1305b5477155d05b88af3bd8d67fc SHA-256: 58e51757070e9f0b2e633cb3e7887a73032b0066ee7bffd6c4b1382f3b41ba8f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing pages. The presence of PDF-specific exploit techniques indicates it is likely attempting to exploit vulnerabilities for client execution.

Machine Learning

Nyx PDF Classifier malicious score 0.9983

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://laborke.ru/uplcv?utm_term=do+clothes+shrink+when+you+wash+them PDF link annotation
- https://hydratrend.com/application/third_party/ckfinder/userfiles/files/35999728246.pdfIn PDF document text
- https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/mo9pqu264mmam5sqkr83sh5i85/vobekivuliwisokejejukugar.pdfIn PDF document text
- https://nidi.mk/ckfinder/userfiles/files/piratija.pdfIn PDF document text
- http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e4b6b042db---56460567179.pdfIn PDF document text
- https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608801e1aa4ea---63212264818.pdfIn PDF document text
- http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a03badce3---72566551460.pdfIn PDF document text
- https://sdhouse.info/ckfinder/userfiles/files/78418109915.pdfIn PDF document text
- https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f22ad51d76---8584190501.pdfIn PDF document text
- https://bem-sa.com/img/file/71436906607.pdfIn PDF document text
- https://coffeetuanvang.com/Images_upload/files/29782893052.pdfIn PDF document text
- https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161262997640cc---rubuwomepadi.pdfIn PDF document text
- https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/87673645747.pdfIn PDF document text
- http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c07eadd8cb---1061440970.pdfIn PDF document text
- https://securityguardsupply.com/php/uploads/file/sujanifijozixazujo.pdfIn PDF document text
- https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607882e5bf293---zifamerisomifelifabo.pdfIn PDF document text
- https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6a204b155---foniginomu.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609900edd102e---6859486328.pdfIn PDF document text
- https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/akcnm12uf4t35aifdkrvq0rcg0/vamalolafava.pdfIn PDF document text
- http://ulrike-mayer.de/userfiles/files/76286447548.pdfIn PDF document text
- https://mimpishio1bet.com/contents//files/pemedifasegevazamebew.pdfIn PDF document text
- http://wintec-samu.hu/uploads/files/pubikejerufosikamone.pdfIn PDF document text
- https://prawobrzeze.info/userfiles/file/tudururesedamarop.pdfIn PDF document text
- http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9474d077b---nirevutofe.pdfIn PDF document text
- http://artside.org/data/temp/file/zagedu.pdfIn PDF document text
- https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/40370bbd4c6b32e2bc4684a3bd58235e/89595564374.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_off0000e153.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE153	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f965.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF965	17600 bytes
SHA-256: `ed7966ac86bc8c092d11f70a9869e5bfc6548cfe3e2915aa2867152e866c377d`
`font_02_sfnt_off000125f5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125F5	10888 bytes
SHA-256: `b7f299f9d7171cf33c977e236f1cba05e958a5dfa223f9a86bb5054178812dfe`

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