PDF malware analysis — malicious · 72c696ae79b91b49

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 08:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 8d26dbafcd7d022d5deac07ab96e6fb2 SHA-1: 57f32be0e8eea892be62f6557844ebfa06d71444 SHA-256: 72c696ae79b91b49d4bd148505df34c822b79e26ce42490a0679fa74be91c92a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the heuristic findings strongly indicate a malicious link farm.

Machine Learning

Nyx PDF Classifier malicious score 0.9925

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ac82c8ecd---48544224787.pdf In PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a950a12f066---suteputexaf.pdfIn PDF document text
- https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/9762gccftnh263nc5g1uqqpth2/kejedur.pdfIn PDF document text
- https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2aaf85c964---86648556197.pdfIn PDF document text
- http://jgbt.us/pds/userfiles/files/widuzejuberibu.pdfIn PDF document text
- http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160823ea449482---22389948483.pdfIn PDF document text
- http://musiclivemarsala.com/userfiles/files/83458389524.pdfIn PDF document text
- http://alimentosldm.com/userfiles/file/kewukaziz.pdfIn PDF document text
- http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095e9c5caebf---jenumu.pdfIn PDF document text
- https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/p9cdtdqja2fohf7eu7fhs72de5/54872524941.pdfIn PDF document text
- https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/c14756c3ae3bac8c0d0f3d7cbb45ed9f/10807886263.pdfIn PDF document text
- https://ikincielinmak.com/upload/ckfinder/files/mopimijawezodoriwa.pdfIn PDF document text
- http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e106bc156af---wemor.pdfIn PDF document text
- http://hbisan.com/userfiles/file/fowimumimabegamalim.pdfIn PDF document text
- https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/e724a410c9rhmcag4l307kvlcc/65630741814.pdfIn PDF document text
- http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dac407346---gukovebifizuvemo.pdfIn PDF document text
- http://densayhongngoai.com/uploads/userfiles/file/24221098989.pdfIn PDF document text
- https://motoralbini.it/files/file/26875911411.pdfIn PDF document text
- https://kildevangen.dk/files/mofuferufexa.pdfIn PDF document text
- https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/32e83ab3707d61fc3e8dd710510563dc/kobaxakividuvinawinaxez.pdfIn PDF document text
- http://brandweeramsterdamamstellanden.nl/userfiles/file/bowevevipajokamimomikog.pdfIn PDF document text
- http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085be97867f5---27998249050.pdfIn PDF document text
- https://stdtekstil.com/upload/ckfinder/files/56164933615.pdfIn PDF document text
- https://aquatrustfina.com/userfiles/file/21518808172.pdfIn PDF document text
- http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609edd845555f---52106713284.pdfIn PDF document text
- http://sweatrinserepeat.com/ckfinder/userfiles/files/vasemewigo.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=kg+to+imperial+tonPDF 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_off0000dd92.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD92	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f5a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5A4	18672 bytes
SHA-256: `338116c39428a540e87000b749401fc3c0b8b36f7a8303c0e5a2f9c5cc3b4d63`
`font_02_sfnt_off000125fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125FE	10420 bytes
SHA-256: `89f8ca4eb0cbffdf1ad332dfffd6996b120a04bc38289c8d24c2be90d7b22855`

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