PDF malware analysis — malicious · 1c487087b5f00194

MALICIOUS

PDF

89.8 KB Created: 2021-09-22 15:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 9d7aa7050bfbbfe487e9ebd18123aca2 SHA-1: 2569e73c0f5a9c3bd70976ee462dc4d5ad8fc4d7 SHA-256: 1c487087b5f00194447bd17e931c8534a36e500701e9e670af7e734f73bba41d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to redirect the user to external malicious content, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9933

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 http://denis-lefebvre-services.com/fichiers/file/61224334925.pdf In PDF document text
- https://worldtradezone.com/userfiles/file/58274879734.pdfIn PDF document text
- https://hkbca.org/UploadFiles/file/20210918214734117.pdfIn PDF document text
- https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614584910b71f---75503229066.pdfIn PDF document text
- http://duoctruongxuan.vn/userfiles/image/file/18123940422.pdfIn PDF document text
- https://deverfgrossiercms.deindrukdemo.nl/upload/files/lonifunakere.pdfIn PDF document text
- https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/05c71207e6903122d6c1505f991818f1/5868083263.pdfIn PDF document text
- https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1aceed0ed---86920081034.pdfIn PDF document text
- http://burbank.kopanramen.com/uploads/files/rulotoretiguviva.pdfIn PDF document text
- http://taiwan-casters.com/userfiles/file/67089865707.pdfIn PDF document text
- http://veszpremlizards.hu/_user/file/dopowaditud.pdfIn PDF document text
- https://mongolia-volkslift.com/uploads/files/89550995785.pdfIn PDF document text
- https://vibangthuaphatlai.net/uploads/files/rapiwosanakavevakoxakof.pdfIn PDF document text
- https://www.blondel-bois.fr/ckfinder/userfiles/files/84554271888.pdfIn PDF document text
- http://bociany.sk/media/file/77153298556.pdfIn PDF document text
- http://tl-maskinfabrik.dk/userfiles/file/86526094030.pdfIn PDF document text
- http://kompassztuki.pl/Image/files/koderirupexone.pdfIn PDF document text
- http://boardmark.com/files/file/rapelupesijabode.pdfIn PDF document text
- https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/a783c1acebaaf2b8edd673228fd7b81a/57655533270.pdfIn PDF document text
- http://bubb.cn/up_file/file/buzejedepofudi.pdfIn PDF document text
- http://www.gabrielamaciel.net/images/content/file/kawetobinovifi.pdfIn PDF document text
- http://thephinhmienbac.com/upload/files/zamepuluwafumigimira.pdfIn PDF document text
- http://creativeindustries.ru/uploads/userfiles/file/12018703295.pdfIn PDF document text
- http://chretkinia.pl/userfiles/file/66153835506.pdfIn PDF document text
- http://mwcapital.net/ckfinder/userfiles/files/xasawajelosulonegajekozen.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pgsharp+pc+emulatorPDF 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
`font_00_sfnt_off0000def3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEF3	17876 bytes
SHA-256: `e220ba111e5e5a04b254b18de5df748ef3f1dddab29c9138a82388d878222829`
`font_01_sfnt_off0000fa34.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA34	10728 bytes
SHA-256: `a1f01ada04badaf628f7b1a413af6c84e7eb31bbc6c9f13c42d7ae554b180f5c`
`font_02_sfnt_off000112f3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112F3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00012b05.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B05	17720 bytes
SHA-256: `30c6d54c0f621e3024ab27d5154480895bd737afdc1a967b404a0bc21b5cbadb`

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