PDF malware analysis — malicious · 9cf898411676767c

MALICIOUS

PDF

72.3 KB Created: 2021-06-29 15:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 71a90b328f6ca77beb3d4c4568f4190e SHA-1: 6f95f48a34efb1f289265433119cae759653d5e6 SHA-256: 9cf898411676767c4be960a3385e7277cdf1967a3c24653e858b586c374671a9

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 WordPress upload directories and other domains, suggesting it functions as a link farm designed to redirect users to potentially harmful sites. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9893

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://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/03dddb3eeb56d75f50e79e5a5e804a7c/xijubavinisekesafugimoxa.pdf In PDF document text
- https://baigiangtoanhoc.com/upload/files/tosas.pdfIn PDF document text
- http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160adacd4e7744---zoteduwiligovuropati.pdfIn PDF document text
- http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b31e493d---58124751965.pdfIn PDF document text
- http://pozitron-s.ru/userfiles/file/54546338172.pdfIn PDF document text
- https://commonwealthsportsawards.com/userfiles/file/duleda.pdfIn PDF document text
- http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca41d86665---17497944127.pdfIn PDF document text
- https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/pvib5tau24ibd257r3c4i0edn6/xuxoxurujovojotilojoz.pdfIn PDF document text
- http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b4631fa1c60---92615876848.pdfIn PDF document text
- http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0590a1c75---sunupepomijazoxopu.pdfIn PDF document text
- https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160beb34292807---93741209306.pdfIn PDF document text
- https://cissud.eu/uploads/ck_editor/files/fenaxovetase.pdfIn PDF document text
- http://aldo-ins.com/userfiles/file/winebivazuf.pdfIn PDF document text
- http://ajisushionline.com/uploads/files/fogoxelu.pdfIn PDF document text
- https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/86e51e28b064bc5cfff727288c7bdbd9/11452640767.pdfIn PDF document text
- http://poltinik.ru/userfiles/file/gefukigovadodixoger.pdfIn PDF document text
- http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb9edcb098---15595813969.pdfIn PDF document text
- http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721a7f71e1a---18970315063.pdfIn PDF document text
- http://jatyn.cn/upfiles/202105/file/1621028952.pdfIn PDF document text
- http://jevades.com/aircraft/fckimages/file/36758675044.pdfIn PDF document text
- https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ff5774d3bb2d6d32057ac38f3c698102/wafanemapur.pdfIn PDF document text
- https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/mtb2b91ikr01v9n0ve93spmq04/76931771879.pdfIn PDF document text
- http://naplesredeals.com/userfiles/files/41997016576.pdfIn PDF document text
- http://tv-kitchen.ru/files/files/sidet.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8604390d2---xikirira.pdfIn PDF document text
- http://varanini.pl/userfiles/file/1141312602.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=movies+to+give+in+damsharasPDF 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_off0000bbb2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBBB2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d3c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD3C9	10708 bytes
SHA-256: `ed7b2b8f99019fd903e8ca96a26a46fe26b2c13d3e19cf51de1df86dd24f05b4`
`font_02_sfnt_off0000ec02.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC02	15480 bytes
SHA-256: `2807e81f1409fcc206ede7d76735ca0978ef5a0dacb124cd4465f57987b4d8c2`

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