PDF malware analysis — malicious · 963c08e02ab1e445

MALICIOUS

PDF

82.3 KB Created: 2021-08-21 08:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 605a77233a3a287d527296c40469bdb4 SHA-1: 74a1f4aed06d09d9b0fd6c02af127049eca32705 SHA-256: 963c08e02ab1e44572ec96c4dd7171ccd1215e20046b205edf04fb79c6c0bf47

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

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://ketchas.ru/uplcv?utm_term=writing+intervals+music+theory+worksheet+answers PDF link annotation
- http://pospatrans.cz/UserFiles/File/sitelifaviwupuzadomes.pdfIn PDF document text
- http://ashioke.com/images/library/File/latidida.pdfIn PDF document text
- https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/2bd4afeb3d3e5b92e29fe31c5bbd5cc1/51392733840.pdfIn PDF document text
- https://www.pepinieres-gey.fr/ckfinder/userfiles/files/nevuwiwakudabevelizofub.pdfIn PDF document text
- http://studioassociatoemc.com/userfiles/files/55085069365.pdfIn PDF document text
- http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29afd930aa---13541081478.pdfIn PDF document text
- http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160755ed8495c0---vukeletid.pdfIn PDF document text
- https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4a6db2e3e1ce255609fe404cbb9d86e8/9155437056.pdfIn PDF document text
- https://lecapsuledigian.it/file/lefoboregosirow.pdfIn PDF document text
- http://vyveva.eu/UserFiles/File/7692641253.pdfIn PDF document text
- http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/zafujijawugup.pdfIn PDF document text
- http://nokianhakkablue.ru/ckfinder/userfiles/files/tujanafajigagozolisuxeb.pdfIn PDF document text
- http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c575d6821a1---davesuriruzekagujuwixafus.pdfIn PDF document text
- https://al-farh-iq.com/upload/userfiles/file/26433833125.pdfIn PDF document text
- https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738be11852f---68413855846.pdfIn PDF document text
- https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/1d3df5313cb019c62158be1e325a6caf/gubifaze.pdfIn PDF document text
- https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4caff5c580---3556577691.pdfIn PDF document text
- https://menuiserie-sainte-anne.fr/userfiles/file/71435380139.pdfIn PDF document text
- https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117863b96f9f---xipufokiti.pdfIn PDF document text
- https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/kj44m2pd541l55rudphja1j8ir/12296835397.pdfIn PDF document text
- https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090660a50e06---ralumoboxunoju.pdfIn PDF document text
- https://elsa-daulte.com/ckfinder/userfiles/files/xunurofetukapafilaga.pdfIn PDF document text
- https://hotellemaritime.com/hotel/upload/files/luvitezulopo.pdfIn PDF document text
- http://ptaki.info/imgekoprojekty/files/jajapagupajezujox.pdfIn PDF document text
- https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074978f7b225---24768700705.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_off0000d7e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7E7	17496 bytes
SHA-256: `9376f54f897cf2513af6a26ab088dc3940f623e367b44dd03c7425211d599eb5`
`font_01_sfnt_off000105c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105C5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011ddc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11DDC	11128 bytes
SHA-256: `976193a482e285c9f9b24fcf7a2debfa35fe1a0c4c6667e4755fbf4654edaefc`

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