PDF malware analysis — malicious · f27b20f9ab5bb6d2

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 22:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: ce2a825749295b928d031e57b0a785c4 SHA-1: 095fcd88b6ef1e664bef3c4e2becae9c116f66f1 SHA-256: f27b20f9ab5bb6d240f6819ac69420461e32329bdd691b24b155e961d9d0379b

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to prompt a user to call a phone number, consistent with phishing or tech-support scams. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

Heuristics 7

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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=setting+up+hotmail+on+android+phone PDF link annotation
- https://feldmann-spedition.de/pics/userfiles/file/9093887788.pdfIn PDF document text
- http://huyndaicaudien.com/upload/files/roxuxowazubonenu.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7a109496b---74953501259.pdfIn PDF document text
- http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613311f8e11fd---73946091535.pdfIn PDF document text
- https://tomorrowhubs.com/upload/users/files/9197861664.pdfIn PDF document text
- http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613286c75e7d2---pasipepixokejowab.pdfIn PDF document text
- http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c115756f1---55734638907.pdfIn PDF document text
- http://sinoorchids.com/image/file/37608799693.pdfIn PDF document text
- https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/2da78d3ae9e7815180f5678e018d8a8d/79622334176.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/87109ea2cc46c36f019475a6751409d3/73903165283.pdfIn PDF document text
- http://3mfa.com/images/editor/files/52703797893.pdfIn PDF document text
- http://topimmigrationlawyer.org/ckfinder/userfiles/files/4705976990.pdfIn PDF document text
- https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/ecfc164c47959d9a518c23a0557a1ecc/dofubodixefodifagumigigi.pdfIn PDF document text
- http://coumert.com/images/file/xuxakawavimogoso.pdfIn PDF document text
- https://warungmimpishio2.com/contents/files/48972348069.pdfIn PDF document text
- http://moriefrusca.com/userfiles/files/34978436255.pdfIn PDF document text
- http://shipsupply.ru/userfiles/files/wopabebusefatuvizimora.pdfIn PDF document text
- https://mimpishio2.net/contents/files/terabanogirefokeli.pdfIn PDF document text
- http://antonellascarpittadesigner.it/userfiles/files/nitezopifurosupuwosijoveb.pdfIn PDF document text
- http://thevalleytrader.com/files/nubol.pdfIn PDF document text
- https://egca.fr/userfiles/file/dekif.pdfIn PDF document text
- http://gitishahjahanpur.org/ckfinder/userfiles/files/6238467711.pdfIn PDF document text
- https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/86d98c07c11c253a76df3c9e0e388ac9/70784735594.pdfIn PDF document text
- http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7dc752fdb---wobuxubobuxorojidalik.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_off0000d757.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD757	10844 bytes
SHA-256: `9e8ba514e10c4b5e20f678c1f6cbff788152f5e187ae843f88c204df7063febc`
`font_01_sfnt_off0000efec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFEC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000107fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107FE	18756 bytes
SHA-256: `9ab9e486a7c792134632cabb3ca6709b93b273dea3474e104f223b9449229800`

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