PDF malware analysis — malicious · ce5b90ba74a3c538

MALICIOUS

PDF

81.0 KB Created: 2021-08-05 04:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 3135c97deca418474bc6c1d03f83fcb5 SHA-1: 6bb159032e590b8eed73367c07033584e114573f SHA-256: ce5b90ba74a3c5387afc921b6385cceb9193db543283cd41a288bb8306b66713

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of numerous links, including those on compromised CMS uploads and disposable hosting, suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

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://yas-center.ru/userfiles/file/lipowopikulipodejoso.pdf In PDF document text
- https://tractorpulling-emmeloord.nl/upload/file/wowelivonorava.pdfIn PDF document text
- https://koncnc.com/genelresimler/file/20865865199.pdfIn PDF document text
- http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/nirupibibozulajixa.pdfIn PDF document text
- https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5mlk105aqadg3a496p68hcrkcl/mikagitezexoposarino.pdfIn PDF document text
- http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0ad0dd0678---molufuwarop.pdfIn PDF document text
- http://dentish.ru/ckfinder/userfiles/files/kafitaxobububebuxodi.pdfIn PDF document text
- http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3e991e22e---mazira.pdfIn PDF document text
- https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160781b3da90ed---verilurameke.pdfIn PDF document text
- https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa02333aa---7581183906.pdfIn PDF document text
- https://thehideawayresortpattaya.com/userfiles/files/32755301096.pdfIn PDF document text
- https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/t35ro29gmqmj2or0kbilkollci/venobakigalaludiga.pdfIn PDF document text
- https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/cab121552093ad9ba907cac3378242e3/70494297613.pdfIn PDF document text
- http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160da032ee85d1---74767444940.pdfIn PDF document text
- https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/4486bcd2291e6cedc6b3a7bb48fac18f/1011724743.pdfIn PDF document text
- http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160765f83b543b---musijimi.pdfIn PDF document text
- https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/76609604a78515d84257f0aeb6b42aaa/97253347501.pdfIn PDF document text
- http://dryoucosmeceutical.com/userfiles/files/bamidekepafar.pdfIn PDF document text
- http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd35e22fca7---7850729853.pdfIn PDF document text
- https://foundryindia.org/userfiles/file/subigepejenovi.pdfIn PDF document text
- https://migger.dk/userimages/file/dokevef.pdfIn PDF document text
- http://www.annaleehuber.com/content_files/file/38376278739.pdfIn PDF document text
- https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/eabb7003e62a00dbf8abc5fa6d0d7a2a/79627055541.pdfIn PDF document text
- https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1db545cf0---zaxolugoli.pdfIn PDF document text
- https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/7a6ba55b8487e9ca7ddd5f8ba25c261e/wowutemenagoxuxunes.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ms+subbulakshmi+tamil+suprabhatham+free+download+mp3+isaiminiPDF 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_off0000d5e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5E7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000edf9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDF9	16836 bytes
SHA-256: `b97bae9ec7fd99ff1986d2e44e09207ea04a7a0b19101e2f23ad9c63357fc6bf`
`font_02_sfnt_off00011a0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A0F	11348 bytes
SHA-256: `c8538e7590bb86562c8f981c90311462ef5345ea9fc3ee4264b1780734cc4316`

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