PDF malware analysis — malicious · eccfd5919a4bca85

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 14:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 3d7ad5c3bb043d7240866f4b91f6e6e4 SHA-1: 943d1ce7b48b7d678a8b4a67412bae0e282fb9a4 SHA-256: eccfd5919a4bca85b27e86c049ecf5f2fb8fbadf3519077c268b5656b606bd02

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to phishing or malware distribution sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=airdroid+cracked+apk PDF link annotation
- http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139ebb433656---3728539336.pdfIn PDF document text
- https://suacuasathcm.com/uploads/files/mutizazeguzaxasavuk.pdfIn PDF document text
- http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5ad292589---96283778228.pdfIn PDF document text
- https://marwaservicecenter.com/nbloom/fckuploads/file/3440359183.pdfIn PDF document text
- http://renknh.com/ckupload/files/rosipix.pdfIn PDF document text
- https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330bb1f2ac1---28202067807.pdfIn PDF document text
- http://bytip.net/filespath/files/20210905133841.pdfIn PDF document text
- https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/c6696e8d3dfb5b4b9e1400a7fe25e0eb/4698094043.pdfIn PDF document text
- http://alliance-ic.ru/uploads/file/24569813582.pdfIn PDF document text
- https://daulte.ch/ckfinder/userfiles/files/defizivuwolufatesapom.pdfIn PDF document text
- http://ei-windykacja.pl/upload/file/84127841228.pdfIn PDF document text
- https://kamarkosong.com/contents/files/bifovejepazuxuzirez.pdfIn PDF document text
- http://mopi.eu/ckfinder/userfiles/files/67364352402.pdfIn PDF document text
- http://celesteandtorsten.wedding/images/file/futopamanijogufuzowex.pdfIn PDF document text
- https://aahs.givingplan.net/sites/default/files/editor/file/xibowotojasesa.pdfIn PDF document text
- https://aathichudi.org/userfiles/file/5581831755.pdfIn PDF document text
- https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/b492513cfa47f15a0275231755896ed8/gikuboneleg.pdfIn PDF document text
- http://mylodge-naoshima.com/images/blog/file/tedazosetal.pdfIn PDF document text
- http://prabashproperties.com/ckfinder/userfiles/files/navibitikesipa.pdfIn PDF document text
- http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143a3ebadf2d---96594871950.pdfIn PDF document text
- https://h16hr15k-h19hr37urn.com/contents/files/55293182220.pdfIn PDF document text
- https://reparationmobile.net/userfiles/file/zujejiwajofasexasule.pdfIn PDF document text
- https://congchungnguyenlieu.vnpec.xyz/uploads/files/49946715593.pdfIn PDF document text
- http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f622ed316f---fexexafole.pdfIn PDF document text
- http://venkateshservices.com/uploads/35532900160.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_off0000da7c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA7C	17076 bytes
SHA-256: `5c2c169186fc0e7d7c5cc19af4915c67a3b00436a0d70d1717c1fcf9500a034b`
`font_01_sfnt_off000106d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106D5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011eec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11EEC	10164 bytes
SHA-256: `f309035bf9a1592765ef3e7f0024d873f5d22d6dba441439ff7cdeef41cf42a2`

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