PDF malware analysis — malicious · fde5ffb47711be9f

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 16:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 0c0e7a41a9b2bdc88af9727d288838b3 SHA-1: 00c070950695544a431588c7795e68b7aede4c0b SHA-256: fde5ffb47711be9fc3a25ce7367b5e25f9a179908706fb13d7d30be3ef98a023

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 to external websites, many hosted on compromised CMS upload directories, suggesting a phishing or link farm attack. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://crewmak.ru/uplcv?utm_term=visual+mnemonics+for+pharmacology+download+pdf PDF link annotation
- https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c63fb6e5137---8393191865.pdfIn PDF document text
- http://ruihuitax.com/files/file/28353798482.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3da8a2462---42290958221.pdfIn PDF document text
- http://gesundimjob.at/images/content/files/xitofutaxagexes.pdfIn PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0bke2gb6v8p7523kef4an5hun7/83243115435.pdfIn PDF document text
- https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/mg1gbnodvpv5bbbmfefvgh3kq8/kovanidolitifasovizesa.pdfIn PDF document text
- http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160837e7fac391---xotupujiledu.pdfIn PDF document text
- http://quangcaosms.org/media/ftp/file/pomapafufarovavabubobuzi.pdfIn PDF document text
- https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/8a19ad7ff7d0bc16783a35f93f7a841d/jubekazozanijosug.pdfIn PDF document text
- http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d724dbf79d---bowibemosom.pdfIn PDF document text
- http://satisfytech.com/ck/upload/files/64438884342.pdfIn PDF document text
- https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/u7ha31pmd7lag2bosfn2nne8pa/10959672904.pdfIn PDF document text
- https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/c8a73611e8ca09979ba14a207f30ebba/pidasalapepo.pdfIn PDF document text
- https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f6162cd0462670c52ffaad0bec6fd5c2/vofuzinulidubogud.pdfIn PDF document text
- http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/9ipul082md1fiebjohtchq5264/judavuj.pdfIn PDF document text
- http://tagsu.com/attachments/fckattachments/file/36725230463.pdfIn PDF document text
- https://fultoys.com/userfiles/59354458160.pdfIn PDF document text
- https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/6bde7sp177ok6idducli140kq6/gosini.pdfIn PDF document text
- https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088b95a2bd04---sitenegapuwuweba.pdfIn PDF document text
- https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f28dfb1cc3c---bidizufiv.pdfIn PDF document text
- http://bsp-plovdiv.org/ckfinder/userfiles/files/gudusiruzobesir.pdfIn PDF document text
- http://diacritic.org/travel/app/webroot/img/files/68772059509.pdfIn PDF document text
- https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083361a29563---gumixulujovuwobebuzo.pdfIn PDF document text
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f7642177f3ef8a724887863ba7e5c90b/kolewikofumovumixesebex.pdfIn PDF document text
- http://hindel-relax.ch/ckfinder/userfiles/files/58826572960.pdfIn PDF document text
- https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a931b6b6417---20900112321.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_off0000de28.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE28	11236 bytes
SHA-256: `846a29ca8392175cd9ea7a1fe8f137b054fb142e7e5192b656768196ad2c7af7`
`font_01_sfnt_off0000f824.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF824	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011036.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11036	16956 bytes
SHA-256: `cd4ae06b7c5a4daeff5b76282d7278293b6ec5d0104a8fb24a42be05e7d6cca6`

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