PDF malware analysis — malicious · 5f2409349d283663

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 16:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 7978da8e3f1a87a123bdacdb186a1341 SHA-1: db1c5e50dce5d9edec4b6a10d190a0dc3a398434 SHA-256: 5f2409349d283663e8a4a1ab6648ace6f23fee0b6f5ae2798aa8eec648d6569f

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. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution lure. The PDF structure and embedded URLs are consistent with a spearphishing attachment, likely intended to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://infrive.ru/uplcv?utm_term=lucerne+switzerland+map+pdf PDF link annotation
- http://schroniskoorzechowce.pl/ckfinder/userfiles/files/tepogab.pdfIn PDF document text
- https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7be6fa675fdca998eb45570abce77882/fubuvugowobofilegalabe.pdfIn PDF document text
- https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9ae444155---baninu.pdfIn PDF document text
- http://apluskleaning.com/admin/images/file/95783231685.pdfIn PDF document text
- http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/u3epvam58tc6triamj5l51nfo3/murupiruj.pdfIn PDF document text
- https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/daqbr7pf61gk0hituikdr5nmg4/kisukovajodetan.pdfIn PDF document text
- https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f99f469d0---77013367227.pdfIn PDF document text
- http://teusz.pl/UserFiles/file/57027190105.pdfIn PDF document text
- http://logo4you.dk/userfiles/file/nabutipasajoga.pdfIn PDF document text
- https://jbdclothiers.net/emailer/userfiles/file/tanexupifofawujuri.pdfIn PDF document text
- https://ruedi-leuthold.com/userfiles/files/vodejogutokixutidebiji.pdfIn PDF document text
- https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/ff38d29c24c9c0d961e295943511b171/wazujalipetixugava.pdfIn PDF document text
- http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160bc56e227857---nilefa.pdfIn PDF document text
- https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746b7237cba---87275448368.pdfIn PDF document text
- http://www.mousumibanerjee.com/fckimages/file/wotewuwusuxojinunumab.pdfIn PDF document text
- http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf091bf067---dunabaf.pdfIn PDF document text
- https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/1dbed0d1e86c00dd8064277147d0ba6a/porajaneviduneritomefige.pdfIn PDF document text
- http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082563032583---25921341017.pdfIn PDF document text
- http://mayingiabao.com/upload/files/2566656309.pdfIn PDF document text
- https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091dc6e7f4f8---jovog.pdfIn PDF document text
- https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/e93a6e8e67ada430dc45f40bf208464b/kinopojufozigibomiwevuxur.pdfIn PDF document text
- https://taichielite.com/louis/taichi/ckfinder/userfiles/files/74670546942.pdfIn PDF document text
- https://gea99.com/ckfinder/userfiles/files/5008506925.pdfIn PDF document text
- http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075b74eb5c06---bafabivamunotomu.pdfIn PDF document text
- http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/17600979333.pdfIn PDF document text
- https://vinacomvietnam.vn/uploads/news_file/63643287823.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_off0000dbc6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBC6	19624 bytes
SHA-256: `7b5629f5d407377c2ecf049f88cc7a84c8932f227ee43bda9335f087f6020dae`
`font_01_sfnt_off00010f4a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F4A	10864 bytes
SHA-256: `0a75c17f5a0797c16b70091c3941f7c8fe19f7c679a3caa4989a156ceaccf2e2`
`font_02_sfnt_off00012877.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12877	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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