PDF malware analysis — malicious · 54d8054f3a917617

MALICIOUS

PDF

86.3 KB Created: 2021-09-05 09:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 56a7acf50f5f8df7c6efd789eecfcc0a SHA-1: 84e03b49258782c52659203d80e3f9ff5203461f SHA-256: 54d8054f3a917617ae5d1a6844a3278c2bd965faa3a11e4539e03c736e1c64bf

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The file's structure and numerous external links are consistent with a tactic to lure users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=combine+multiple+pdfs+into+one+pdf PDF link annotation
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c093ff1a0e---63137927062.pdfIn PDF document text
- https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/29e2c2a7b94436ede505d8efb7fca2b0/87935211782.pdfIn PDF document text
- https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/qorblacgbrpaujugbplmcrtmg5/69313232662.pdfIn PDF document text
- http://decom.pro/admin/ckfinder/userfiles/files/94393382976.pdfIn PDF document text
- http://anhbanglaw.com/userfiles/file/dirivo.pdfIn PDF document text
- https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f8d077806---71519661204.pdfIn PDF document text
- https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611611cdbb722---66917436782.pdfIn PDF document text
- https://jxlmedu.com/file/files/20210630_222555.pdfIn PDF document text
- http://lateonsettay-sachs.org/userfiles/file/sabekasom.pdfIn PDF document text
- https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2825577f1---82086133457.pdfIn PDF document text
- http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609495db4d21c---furaxijomigaz.pdfIn PDF document text
- http://clinivetmadonnadirosa.eu/userfiles/files/65539856101.pdfIn PDF document text
- http://uco-kampen.com/media/files/lorexiwotuguv.pdfIn PDF document text
- https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/cca0197fa9dada9e142132a64e0f3cf8/73769324871.pdfIn PDF document text
- https://itracmediav5.com/ckfinder/userfiles/files/kisareveroremisarafej.pdfIn PDF document text
- https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/bf3172b4438edad0d6cf7914395b49d4/temib.pdfIn PDF document text
- https://crc.creativechange.net/ckfinder/userfiles/files/luxexufugibatebatum.pdfIn PDF document text
- https://speakingparrot.com/upload/ckfinder/files/31305452778.pdfIn PDF document text
- http://hengtaixin.com/HangShun/ckfinder/userfiles/files/denosobesujufigumaboxosa.pdfIn PDF document text
- https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/a45bf66ebd9326911fa4529131b1aa5e/90203599826.pdfIn PDF document text
- https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/b02l07n9933pig3pno7l6obnqt/riminagaxomolemejukokil.pdfIn PDF document text
- http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47e6a8881e---78170901401.pdfIn PDF document text
- http://christschoolblr.in/userfiles/file/60895330759.pdfIn PDF document text
- http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7820f8c971---xodamurapekiruxikesulu.pdfIn PDF document text
- http://bojovesporty.cz/userfiles/file/25802182248.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_off0000ee35.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE35	10668 bytes
SHA-256: `5e48a83edf8a37fe5684468ace797923d110d9fb035632ebb3e3b63a5692d517`
`font_01_sfnt_off00010666.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10666	17340 bytes
SHA-256: `93203447078ca6f80f0c23e32feb6b334d0f8d56652366cd98008fe4f696969d`
`font_02_sfnt_off0001335a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1335A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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