PDF malware analysis — malicious · 3e80d6b08cc9e4dd

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 18:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 87d12a2a85914815b4fc27e005bb6390 SHA-1: 33a703fb98bc102cf2cb17fbdb9d7bc74d5019b5 SHA-256: 3e80d6b08cc9e4dd632096b2cba0ba7fbcc44a0fa62bc9d4157dc96717477c2e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a common attack pattern for malicious PDFs.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://garglob.ru/uplcv?utm_term=scantronic+9448+manual+free PDF link annotation
- http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609833c27e6f2---bonilenevitubu.pdfIn PDF document text
- https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/ae779c421b902f75570db124e375253b/41060818677.pdfIn PDF document text
- https://binarbaidrealestate.com/public_html/userfiles/file/bexezegigogosatajekuxavor.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc84eae544---vorobovik.pdfIn PDF document text
- https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/q7jaqer291pb2ev2480s5cb1f1/busejemokaxa.pdfIn PDF document text
- http://adabaskimerkezi.com/upload/file/liladowe.pdfIn PDF document text
- http://inbiosa.eu/static/cfiles/files/26351752615.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e65f9a58f---loneduxotupezopitufulajuz.pdfIn PDF document text
- https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/74f4fb9519dfc1231467cd53cb55807d/filoxuxegulesuw.pdfIn PDF document text
- https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4bc5c61d9---garezebufozobuv.pdfIn PDF document text
- http://driver-jazda.pl/upload/file/pevewawezefasotaratim.pdfIn PDF document text
- https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1557eebf3---jodajesifokexakuxa.pdfIn PDF document text
- http://ekolojikweb.net/upld/userfiles/file/68255647196.pdfIn PDF document text
- https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082409be4758---14209045863.pdfIn PDF document text
- https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160790d123043b---35443457584.pdfIn PDF document text
- https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/f0d9c50367035f2829c55fe93cf2e009/11748882157.pdfIn PDF document text
- http://parentini.it/userfiles/files/78399205987.pdfIn PDF document text
- https://cvsc.co/userfiles/file/toruwoborosexuxufewevu.pdfIn PDF document text
- http://karpatskiles.ru/store/file/53856587795.pdfIn PDF document text
- https://doctornhospital.com/banglanews24/editorsfiles/files/misaxomevunubabor.pdfIn PDF document text
- https://jxlmedu.com/file/files/20210818_005252.pdfIn PDF document text
- http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77ce019d4e---zosaxelamowetidu.pdfIn PDF document text
- https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b9d0cc67a78b5f41107d014b164fe0dd/tovukev.pdfIn PDF document text
- http://stacjaregeneracja.pl/userfiles/file/5419353191.pdfIn PDF document text
- https://pharma-tools.eu/galeria/file/wilagewuj.pdfIn PDF document text
- https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/pj5g8mb9rpm2clg7nmegh8c92e/golenataposovebosusetogol.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_off0000cc55.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC55	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e467.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE467	17500 bytes
SHA-256: `0f1aad35a79c626478b4486d9100bd3d96ab5b88714249ce4838f7bd86c8dbed`
`font_02_sfnt_off00011204.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11204	10960 bytes
SHA-256: `a8916ae6e7cdbfa96e6000090813cb7012887b94803483e967ac91baa17662aa`

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