PDF malware analysis — malicious · dc8c9b5411592d90

MALICIOUS

PDF

94.3 KB Created: 2021-08-15 10:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: f0a005cc38db696942f7422648a93cfa SHA-1: 3ad71d0199197c886039ade57542a19101a3d103 SHA-256: dc8c9b5411592d906abd55c85c6db5c6a0d7525abd10ae5cfcda29288c9cb58a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external resources, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9916

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 http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609edfa4633ad---43510256015.pdf In PDF document text
- https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/7b14b02dc14afcb0f852be1e6e9fe712/xidelitorakezuneruko.pdfIn PDF document text
- http://vinhthuan.asia/upload/files/gomazenenakumawada.pdfIn PDF document text
- https://thepainter.asia/upload/files/58021833008.pdfIn PDF document text
- http://seamcc.com/UserFiles/files/53192755579.pdfIn PDF document text
- http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b99ab97ff---31827796333.pdfIn PDF document text
- https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c8041ddb771ca24c9d9b66f932eb4697/gajasuxoz.pdfIn PDF document text
- https://topinsolventa.ro/userfiles/file/metewikexor.pdfIn PDF document text
- https://egyptsuntours.com/userfiles/files/84967046546.pdfIn PDF document text
- http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16102b2984dccc---6629897748.pdfIn PDF document text
- http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f9955094739---4125339933.pdfIn PDF document text
- http://hwayinn.com/image/files/20210808_085945.pdfIn PDF document text
- http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807f15e4e8d---gagarozufuwufevesukagudi.pdfIn PDF document text
- https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/e6dbe2b42372cc9a8a79d5eede600a9d/35871887761.pdfIn PDF document text
- https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/6hnac91bjqgog5sea7b0242q7n/65932447849.pdfIn PDF document text
- https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39a1381261---xuzugijilepisamufebirav.pdfIn PDF document text
- http://salonorganica.ru/upload/files/48625886531.pdfIn PDF document text
- https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/b70577df0a526e75d6dc80b1ac40aaea/18669869533.pdfIn PDF document text
- http://kajsanordstrom.com/userfiles/files/37155477655.pdfIn PDF document text
- http://sns.hu/_user/file/55085277316.pdfIn PDF document text
- https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5831b65bc---46551262071.pdfIn PDF document text
- https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/a05ce7df7f81ec35332e156a62cb9dda/77372152956.pdfIn PDF document text
- http://danfilenemd.com/clients/67744/File/sopetafam.pdfIn PDF document text
- http://egyptlance.com/userfiles/file/89782100948.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ejercicios+de+matematicas+sexto+de+primaria+para+imprimirPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f12c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF12C	10740 bytes
SHA-256: `0780e0583e9ecfb3d05318e0ade3bb0ae863f0faf3905ca4450174921e07debd`
`font_01_sfnt_off000109df.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109DF	16068 bytes
SHA-256: `6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d`
`font_02_sfnt_off00011eff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11EFF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00013711.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13711	18772 bytes
SHA-256: `d654c99c99cb910d9da74bfd887eed1c23b59f7e4739327c419aff187f73861e`

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