PDF malware analysis — malicious · 2a2e7db6c94d3a22

MALICIOUS

PDF

77.1 KB Created: 2021-09-19 15:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 9bc443f41f441f8d8f2c02b85d36f883 SHA-1: db231ee7ab8f42a7753d061df6554028080a6654 SHA-256: 2a2e7db6c94d3a229c0a6624c1ab7b7cc0d24ff9ae2b87fcca8e9c69f67a37de

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to exploit users through deceptive links.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://philabc.ru/uplcv?utm_term=halo+combat+evolved+free+download+unblocked PDF link annotation
- https://bearings.vn/images/ckeditor/files/guxanumalosumolegav.pdfIn PDF document text
- http://idrogastermoclima.it/Utentifile/FCKPage/file/19083635951.pdfIn PDF document text
- https://blueparadise.pl/userfiles/file/67577309190.pdfIn PDF document text
- http://ijdssymposium.eu/upload/lowesijezozijabobugotewoj.pdfIn PDF document text
- https://emotionalgift.com/ckfinder/userfiles/files/49838868200.pdfIn PDF document text
- http://sibinetweek.ru/userfiles/file/22609410523.pdfIn PDF document text
- https://psg66.ru/admin/ckfinder/userfiles/files/fawurulupolofowevivoj.pdfIn PDF document text
- http://kruengrangthai.com/files/files/275917584.pdfIn PDF document text
- http://www.valathors.com/ckfinder/userfiles/files/61214349185.pdfIn PDF document text
- http://mjacz.cz/soubory/files/goguzaveruxuvevadojin.pdfIn PDF document text
- http://frutapac.es/ckfinder/userfiles/files/pejelow.pdfIn PDF document text
- https://cpsguffanti.com/uploads/file/95456897382.pdfIn PDF document text
- http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e9f82a596b337f46eac24a062aff965d/38550137550.pdfIn PDF document text
- http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b0cf16eec---wosofesuwelanowufubepaxo.pdfIn PDF document text
- https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/13842bf7c8a711451f38f81f6ad05fc2/48907168247.pdfIn PDF document text
- http://esipro.be/userfiles/file/2999290316.pdfIn PDF document text
- http://christ-china.com/filespath/files/20210917155201.pdfIn PDF document text
- https://masihpt2.com/contents/files/rimekew.pdfIn PDF document text
- http://chaireyes.com/v15/Upload/file/202191980203995.pdfIn PDF document text
- http://dgxzz.com/uploadfile/file/67399148382.pdfIn PDF document text
- http://kleinschadenexperte.de/userfiles/file/jajemutasobuvepufomiku.pdfIn PDF document text
- http://uniradioweb.info/userfiles/files/purivevipasumudulezolixe.pdfIn PDF document text
- https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d83aaa60fe714d64becd6ba4aa6afd41/mamoxupesa.pdfIn PDF document text
- http://guide-eq.com/userfiles/file/20210916053132_3yvkwn.pdfIn PDF document text
- https://digireg.nu/upload/26953114819.pdfIn PDF document text
- https://stdtekstil.com/upload/ckfinder/files/wudagufusod.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_off0000c30b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC30B	18500 bytes
SHA-256: `eb3090651701e81b1ed88d0ad7223e6f2ea1617e5a56b115cc9c1369c6b1a855`
`font_01_sfnt_off0000f3a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3A8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010bbf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BBF	10852 bytes
SHA-256: `f626f892ca70763018d2d5101b3c27411e4f19cdc06e1122258383aa5dd3c2e0`

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