PDF malware analysis — malicious · 6181863c5810c859

MALICIOUS

PDF

90.1 KB Created: 2021-07-05 16:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05

MD5: fb86bd3e3425b8031b1b73abeee31943 SHA-1: e1dae8cb7f6e723ebff87620c3386c88fcbbea6d SHA-256: 6181863c5810c8599fa3aee9558816a83acd1bf011d6bb1f4225c104d7687657

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farms, with several pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these external links. No scripts were extracted, but the structure and URL analysis suggest a malicious link distribution pattern.

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://nomylo.ru/uplcv?utm_term=subluxation+of+tmj+treatment PDF link annotation
- http://lyshiying.com/d/files/lebovafawomagewur.pdfIn PDF document text
- https://arhometutor.com/userfiles/file/60825533040.pdfIn PDF document text
- http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b174d2bacd1---rujusaverawipa.pdfIn PDF document text
- http://www.awakohchang.com/image/upload/File/5224741804.pdfIn PDF document text
- http://alphabodysupplements.com/newerac2c/userfiles/file/42524410192.pdfIn PDF document text
- https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8494fd9919d450c2ccae350bf0778573/79469405519.pdfIn PDF document text
- http://debandhelder.nl/ckfinder/userfiles/files/paxilazenemutozureb.pdfIn PDF document text
- https://beautydiction.com/ckfinder/userfiles/files/97435343239.pdfIn PDF document text
- https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe1af635a9---54846750659.pdfIn PDF document text
- https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/705138fd389f6b19e91a559d608e2829/25236061393.pdfIn PDF document text
- http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e2cb3db0730---jijapixo.pdfIn PDF document text
- https://decoveinvestment.com/userfiles/file/4057512707.pdfIn PDF document text
- http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/bd4200d176653ff0b6d15d07273e64d9/danotinopov.pdfIn PDF document text
- http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/1196198422.pdfIn PDF document text
- https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/c3b3633d39a89e29aba41d4b0f1e2d32/kekopekojuzav.pdfIn PDF document text
- https://floraplant.gr/FCKeditor/userimages/file/relonobewobujuwum.pdfIn PDF document text
- https://tortugafilms.ca/adminfiles/file/72588682064.pdfIn PDF document text
- https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9bf1d666b216463f29b0431660e679f8/71270103738.pdfIn PDF document text
- http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607316b585b3b---degedasubomatalutad.pdfIn PDF document text
- https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/e898c8d293b8ef7a4d1be3a6ee84127f/70077725028.pdfIn PDF document text
- http://yonezawanet.jp/units/24250/zcycom/files/53934721217.pdfIn PDF document text
- https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/u9dmp69eaqnhgrihte7i8lt3o3/zukiridil.pdfIn PDF document text
- https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/16vscqk7go22a3orl0ha1anklv/mibuzapumafutinefebelovuz.pdfIn PDF document text
- https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a535e4ae83760e1e0fa646166666f21e/44811330258.pdfIn PDF document text
- http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf46a89fcc4---juzumufezuxonowam.pdfIn PDF document text
- http://camionespanamericana.com/userfiles/file/pujevogigexesuwokipekeg.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_off0000fe12.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE12	16976 bytes
SHA-256: `ba8fd36070bf020027e83abe925637296b6498781f6ba0d6d58ba5c57395ace3`
`font_01_sfnt_off00012a76.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A76	10752 bytes
SHA-256: `d86712b0eb9ee52357c56537f887608327c87838d26693adb3b08e744d5d431c`
`font_02_sfnt_off0001432c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1432C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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