PDF malware analysis — malicious · 937c5c4d99e3b3c9

MALICIOUS

PDF

86.7 KB Created: 2021-08-09 14:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 375427b4d623446864b22aa025e26523 SHA-1: af0b51f74be838435c2a3e590a739cd35fee8d5e SHA-256: 937c5c4d99e3b3c989aed50a55448add206ea97ccccf868eaaf2df88ce938649

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate an attempt to deliver a malicious payload or phish users.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=how+to+make+the+best+slime+ever PDF link annotation
- https://canionglobal.com/FCKeditor/file/5952328433.pdfIn PDF document text
- https://mujeresenmovimientoplus.com/userfiles/file/70826333360.pdfIn PDF document text
- https://arbormaster.net/uploads/files/gonegexutexodabovasowuzor.pdfIn PDF document text
- https://mwasafat.com/uploads/files/50920855550.pdfIn PDF document text
- http://www.urbanwaterways.info/files/jadelas.pdfIn PDF document text
- http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070d11fc878e---powunawedasekup.pdfIn PDF document text
- http://kimandyoo.com/userfiles/file/lawak.pdfIn PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c58fabad243---tuvok.pdfIn PDF document text
- http://rentbucharest.net/images/userfiles/bokomejamapime.pdfIn PDF document text
- http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d2b0a14d0---32697049584.pdfIn PDF document text
- http://volkshilfe-ktn.at/images/content/files/sijezumakinaz.pdfIn PDF document text
- http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160820b790709b---26305631406.pdfIn PDF document text
- https://balaji-technology.com/userfiles/file/62891076595.pdfIn PDF document text
- http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/sukizaxub.pdfIn PDF document text
- http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/9c67020ae6ed6500da1f1d463d06f5e8/8352499691.pdfIn PDF document text
- http://reelproductionshd.com/userfiles/file/vodunanopupimiso.pdfIn PDF document text
- http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/4200973548.pdfIn PDF document text
- http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50895764239.pdfIn PDF document text
- http://beadsandsupplies.com/images/file/77713275403.pdfIn PDF document text
- https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/6ce3d1402479ea32f528b344aebba2a5/92056145534.pdfIn PDF document text
- http://gt-outillages.fr/ressource/site-image/files/56424365973.pdfIn PDF document text
- http://inistor.com/ufiles/files/ligediweladuzamixebavib.pdfIn PDF document text
- http://canvangdientu.com/images/file/biliwuvoka.pdfIn PDF document text
- https://33mobility.net/uploads/files/7552562964.pdfIn PDF document text
- https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/98922ef387e220c0b4fadf2fde574ed5/63812890958.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_off0000ed58.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED58	18108 bytes
SHA-256: `ead3b47e0b8fa1a91cef66cd8dc07359ddca4ff20203ca78dde6f087b5ebdce2`
`font_01_sfnt_off00011c6f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C6F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013486.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13486	10644 bytes
SHA-256: `353aa5e74f91724ea3e243600ad9006261736312f6da18779c6dfa60b73fc405`

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