PDF malware analysis — malicious · dd8ec41535761ebc

MALICIOUS

PDF

76.0 KB Created: 2021-09-07 06:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 1052dc2619e255ed2e524b19f6523f1a SHA-1: 73792e0c0f4013ffd211788549af82579349140f SHA-256: dd8ec41535761ebcf6002542afe40321c1c3a9859fc996017c19f7531a09ac31

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded link farm.

Machine Learning

Nyx PDF Classifier malicious score 0.9827

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://jagamimpi.net/contents//files/4306163820.pdf In PDF document text
- http://dralituncer.com/userfiles/file/gozegu.pdfIn PDF document text
- http://margheritango.it/userfiles/file/68623006738.pdfIn PDF document text
- https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/cf9dd918412e8af378e93a6592a3e3ff/miferoxigesos.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110b0c91f3ea---61132017539.pdfIn PDF document text
- https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/5789991a09b571296499c1c0c62fd1df/51967652923.pdfIn PDF document text
- http://dorapeyzaj.com/userfiles/file/25062137561.pdfIn PDF document text
- https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810696aaa49---91679156462.pdfIn PDF document text
- https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a56de49a5e---futiwe.pdfIn PDF document text
- https://luyenthitoeic.info/userfiles/file/nemozetimu.pdfIn PDF document text
- http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba04c11caae---sijupavixibumadubesu.pdfIn PDF document text
- https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705b75e68c7---dajosuboxiwito.pdfIn PDF document text
- http://luisacortesearchitetto.it/userfiles/files/genux.pdfIn PDF document text
- https://mttrasportisrl.it/dati/upload/file/jurawesakulux.pdfIn PDF document text
- http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3671f2869f---pitewarudujobefogutunari.pdfIn PDF document text
- http://xn--z92bzy85x.com/userData/board/file/fumizukeginiveluv.pdfIn PDF document text
- https://ckmusicdesign.nl/userfiles/file/43456662306.pdfIn PDF document text
- http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160736820454c5---93552019300.pdfIn PDF document text
- http://championshipsportsrings.com/clients/23492/File/51691154558.pdfIn PDF document text
- https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/25025923268.pdfIn PDF document text
- https://crpm.ch/ck/ckfinder/userfiles/files/60412342095.pdfIn PDF document text
- http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/o8rl29hf21vgo8htu3aao51e9n/pavikijad.pdfIn PDF document text
- http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/a3d4a4e69e4e962e10244925a82dbea7/zofavadupizidavikunedebob.pdfIn PDF document text
- https://agape4u.org/userfiles/file/31791515194.pdfIn PDF document text
- https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c2bee5646f55d492a30eab8883f8d0c0/78500187451.pdfIn PDF document text
- http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfc73c5cd7---59287119603.pdfIn PDF document text
- https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613582aac3223---34707626591.pdfIn PDF document text
- https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0beae5c36---32387537496.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ing+verbs+worksheet+for+grade+2PDF 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_off0000c5d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC5D0	10948 bytes
SHA-256: `f594f5ff258ccd7a781d23652d613bdf9a326c1a153374493eda35424d1c148d`
`font_01_sfnt_off0000df15.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF15	16796 bytes
SHA-256: `5e4d1d4e743171726af7f950a1e1ca0d8cd5100c0330a0f22d6b0f6bfbce64e5`
`font_02_sfnt_off00010a88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A88	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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