PDF malware analysis — malicious · 4a7314a9b9b23842

MALICIOUS

PDF

100.0 KB Created: 2021-07-19 18:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: e24c14aa4e429af632fc9e01898983ad SHA-1: fd67be7bd96c3c6ad091920c55e5ff492410ba9f SHA-256: 4a7314a9b9b23842c468a00abfae3cedd942f1a44b44ea2d6fd2d7854346b457

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's a lure document, likely intended for phishing or distributing further malware, hence the T1566.001 technique.

Machine Learning

Nyx PDF Classifier malicious score 0.9800

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://namdolove.com/FileData/ckfinder/files/20210605_0E93C255AD3FCCDF.pdf In PDF document text
- http://malifer.hu/upload/file/43995628723.pdfIn PDF document text
- https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ch1lc52fp3vuofqb4hnf8blijl/42553891676.pdfIn PDF document text
- http://constantemails.com/userfiles/file/1623261844gerorew.pdfIn PDF document text
- https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d5b8a7314---5513855310.pdfIn PDF document text
- https://businesslife.com/content/file/674613491.pdfIn PDF document text
- https://artofsurfing.com/preview/ckfinder/userfiles/files/98411965200.pdfIn PDF document text
- http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a40bf189b2031e86cdf7c8067824c6ed/25150098940.pdfIn PDF document text
- http://skogsformedling.se/bilder_umeny/File/warijulolasere.pdfIn PDF document text
- https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/b757o22a0tk439pdiil7p2kga5/bolij.pdfIn PDF document text
- https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e01ab0a427af60519b74cbfc8e1b0b23/jujugofezusijerimuwuk.pdfIn PDF document text
- http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077d7cd87879---64758736234.pdfIn PDF document text
- http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870c1674e95---82715829682.pdfIn PDF document text
- https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/bd435393b36f67cf7770ade6df6605f0/wukoledonotipesagavunu.pdfIn PDF document text
- https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/9a3eb3ec9aabbec5358ca4109659d51f/24736999562.pdfIn PDF document text
- https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/psds957pp919e5aiik3jhjmcn0/75017649244.pdfIn PDF document text
- https://bdaudit.ro/userfiles/file/22377029034.pdfIn PDF document text
- http://gumberryoleschool.com/clients/33891/File/43673988384.pdfIn PDF document text
- https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095dd1b08a01---13642614623.pdfIn PDF document text
- https://cahayaapi1.com/contents//files/23435524112.pdfIn PDF document text
- http://zuestag.ch/userfiles/files/virafuwuneputor.pdfIn PDF document text
- http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad73cb0635c---57627372423.pdfIn PDF document text
- https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/8hqjn7gaqsd5ibgk93am8jn125/2044440265.pdfIn PDF document text
- http://sacoorhealth.pt/site/upload/file/zasizepa.pdfIn PDF document text
- https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/ca4e75ee72ca3b571c9cab571bea31f8/mevono.pdfIn PDF document text
- https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/2oj14v9bp5l5119impocd9he22/vunavijotusovujadur.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+polarization+in+psychologyPDF link annotation
- 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_off00012401.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12401	17428 bytes
SHA-256: `e500abd2cd9f46f22412b9a231db63677cdd1fb7d17182689e93fbd761005e9b`
`font_01_sfnt_off0001518f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1518F	10688 bytes
SHA-256: `25ffe188e0af95531274e6450a05414b4d14a8a546be1b4c46b409d702d38033`
`font_02_sfnt_off00016a1e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16A1E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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