PDF malware analysis — malicious · 9dabc0316689096a

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 07:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: fb2cfc6d5e1dd9cd15d7b0336a23f5c6 SHA-1: 75f005d05e0b5681f018f471201d1a89d44c9a7d SHA-256: 9dabc0316689096a25fad4803e4301096fc177477dab6b6092634f648f590f3e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs, such as http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393956800f0---pixapota.pdf, suggest an attempt to host or distribute further malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

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 http://dalnoboy.org/data/filestorage/upload/files/tatideme.pdf In PDF document text
- http://www.siscbolivia.com/admin/uploaded/fck/file/xeposuzekemuw.pdfIn PDF document text
- http://aa-nusd.jp/33165372116.pdfIn PDF document text
- https://pametnidom.hr/pametne_kuce/userfiles/file/32739498094.pdfIn PDF document text
- https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/gatubepagu.pdfIn PDF document text
- http://www.otevrenysklep.cz/ckfinder/userfiles/files/90556990685.pdfIn PDF document text
- http://uticachemical.com/files/upload/files/14377084710.pdfIn PDF document text
- http://soosanfix.com/upload/fckeditor/file/nofowereguporezo.pdfIn PDF document text
- http://wujipacking.tw/upload/files/36209281421.pdfIn PDF document text
- https://essuances.com/ckfinder/userfiles/files/xigavotubowigenoluwuri.pdfIn PDF document text
- https://ukmalayalamnews.com/userfiles/file/18462187697.pdfIn PDF document text
- https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ad981f39604a483b2302c9089030a7f3/vabelopavirezixaxafu.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f539c33cb6---17283160375.pdfIn PDF document text
- https://tavio.ru/files/file/luwezigarelamuwunipanuf.pdfIn PDF document text
- https://www.gico.ge/ckfinder/userfiles/files/12025242011.pdfIn PDF document text
- http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335fc48dada---wabonet.pdfIn PDF document text
- https://glaze-metalart.com/upload/files/82764722060.pdfIn PDF document text
- http://aliguoriarchitetto.eu/userfiles/files/pepaxilizosufime.pdfIn PDF document text
- http://odontoflash.eu/userfiles/files/gapikipajilupozebulo.pdfIn PDF document text
- https://www.fangjin.org/ckfinder/userfiles/files/89888595127.pdfIn PDF document text
- http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393956800f0---pixapota.pdfIn PDF document text
- http://belst.by/upload/file/30374770765.pdfIn PDF document text
- https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b774f1fe87---kupizesebali.pdfIn PDF document text
- http://ctkupavna.ru/upload/file/90536714553.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=english+speaking+countriesPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e1bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1BF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f9d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9D1	18416 bytes
SHA-256: `c5b8a1659ace477cbd021b71a5877bb57568eb35ad282aab068d81cd5b1463ad`
`font_02_sfnt_off00012a11.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A11	10828 bytes
SHA-256: `ef8ff247565e414b6ad6910e88a842910bf9a40a2016390ce8b59aad130127c8`

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