PDF malware analysis — malicious · 2885646889db8c16

MALICIOUS

PDF

88.9 KB Created: 2021-06-28 05:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: b1ad37c7e6034de8c77c9bc228bcdb27 SHA-1: bebe6ec49f0db750c2693807e22cea293f8491e3 SHA-256: 2885646889db8c16e943d560b1243406fc245e1407ce66fdb075eb841fca23ec

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, offering no direct user-facing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://infrive.ru/uplcv?utm_term=simple+conversation+between+two+friends PDF link annotation
- https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/v11i8qo762pi0cg0n0n5dnjfp8/75723811699.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/e64t967t6eung2ufbv27gg17m7/xovebovetepopawipuwon.pdfIn PDF document text
- http://incucinaconalberta.com/userfiles/files/17035106575.pdfIn PDF document text
- http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607016792d9b1---56741924650.pdfIn PDF document text
- http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adcf22b290b---10143411957.pdfIn PDF document text
- https://audit-advisers.com/userfiles/file/toxuwamizoxokokurabozum.pdfIn PDF document text
- https://miet.hu/kepek/dojazarizutezozudupe.pdfIn PDF document text
- http://liccuza.ro/stiri_files/file/18906528917.pdfIn PDF document text
- http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b471ec55abe---bivogezopupoxura.pdfIn PDF document text
- http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ac70017bbdc---4022425659.pdfIn PDF document text
- http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f72a208750---92730501633.pdfIn PDF document text
- http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d8dfba74d---vitumovomudojomamolufala.pdfIn PDF document text
- http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4ce18d022---joverugajiwibifelokivewij.pdfIn PDF document text
- https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/hu1esvtmp8865dq53sh0d7pta8/40060423683.pdfIn PDF document text
- https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160850f8b79d2e---talomopesem.pdfIn PDF document text
- https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607439ca884c4---bitib.pdfIn PDF document text
- https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/2cefd890b249c4605e29c6cbe486244c/paxubamorinipimibu.pdfIn PDF document text
- http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a673d3e546d---84832654788.pdfIn PDF document text
- http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1602cc508---27600323818.pdfIn PDF document text
- http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/c57219339b778699ec5b61248d0df0ce/15121881984.pdfIn PDF document text
- http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f2124aee7---xijizer.pdfIn PDF document text
- http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcea446bd1---bavop.pdfIn PDF document text
- https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/80d7c8f070f34a8b93fda3e47e8b5113/9696597331.pdfIn PDF document text
- https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/317b639bdbaa024c452e504acf3f8247/60988015351.pdfIn PDF document text
- http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855ef29b12e---voborudopamitu.pdfIn PDF document text
- http://longearedhounds.com/clients/65743/File/4890094057.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_off0000f806.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF806	16972 bytes
SHA-256: `c9a98eb646ae9bb8169b0004db931dff35da53361258bb205057e6fef570e82d`
`font_01_sfnt_off000123fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123FB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013c12.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13C12	11148 bytes
SHA-256: `2b9c2ee6aaaae649893402726f7d595f5d16c702fdd553fd1942bbed82ff6008`

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