PDF malware analysis — malicious · cd0ca3f4d557491a

MALICIOUS

PDF

86.6 KB Created: 2021-09-03 03:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: abe06a0fa19ca8bc0d8c3600ced3f97e SHA-1: c88336eaaf993e57ae682d98ac9d1b448b1c186d SHA-256: cd0ca3f4d557491aaf89e0e50619ed8eb467a6a529b76eaec202db7c9a9b4d19

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM rule strongly suggest the intent is to lure users to potentially malicious sites. No scripts were extracted from this sample.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=learn+spanish+easily+pdf PDF link annotation
- https://elearning-chemistry.ro/userfiles/file/74128546125.pdfIn PDF document text
- http://avvocatoandreabruschi.it/userfiles/files/ruzabaxe.pdfIn PDF document text
- http://choinka4x4.org/cms/files/file/lorigebuxuma.pdfIn PDF document text
- http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ec6mtci7gct5c86t2fnnlh46k5/36589290884.pdfIn PDF document text
- https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/ecfee842724d5798b648c710817bad16/87236556705.pdfIn PDF document text
- https://tennis94.fr/img/pics/files/xaminilobasufufi.pdfIn PDF document text
- http://palaciodelosnavas.com/userfiles/file/muwaj.pdfIn PDF document text
- http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d26860a8cf---jobotusonukizupiviravu.pdfIn PDF document text
- http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/rupefinebotezum.pdfIn PDF document text
- http://erulingua.hu/uploads/content_files/files/nigapim.pdfIn PDF document text
- https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/c9bafb8247121a00ba69e5d8d66d8d4e/5120178076.pdfIn PDF document text
- https://samudra99.com/contents/files/lebubokujajabidedabutu.pdfIn PDF document text
- http://art-lan.ru/uploads/assets/file/74345890993.pdfIn PDF document text
- https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/805616c8ebbbfcc6c8ebc170b6c2edb6/fuluzitetirotukavovunos.pdfIn PDF document text
- https://carparts-fixture.com/file/file/vopezi.pdfIn PDF document text
- http://kartinatv.org/uploads/files/zurawewitorojokaz.pdfIn PDF document text
- http://ajmason.com/admin/ckfinder/userfiles/files/jagowidorigi.pdfIn PDF document text
- https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e94576b7dd2---80573004304.pdfIn PDF document text
- http://altaprecision.com/userfiles/file/xawilexureno.pdfIn PDF document text
- https://tanhoaphat.vn/userfiles/file/79156500305.pdfIn PDF document text
- http://maximaviajes.com/FCKfiles/file/32109074445.pdfIn PDF document text
- https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f10c33e251d---xeriguveledibe.pdfIn PDF document text
- http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/jenizojoramovux.pdfIn PDF document text
- http://iehyun.com/editorupload/file/75210923657.pdfIn PDF document text
- http://citadelcaralarms.com/userfiles/file/mutexuko.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_off0000ecc5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECC5	10448 bytes
SHA-256: `8977dfb0bd8f15c1b5dff887a5d2e7c08cdb4cc798dcf5a59292683c03bb509d`
`font_01_sfnt_off0001044d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1044D	18604 bytes
SHA-256: `9a1bfd3ca84bc2bb2aa200d728440d77e4a5d15a3d23351930b88867a232024b`
`font_02_sfnt_off00013490.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13490	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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