PDF malware analysis — malicious · ff61ed6a3891e7fc

MALICIOUS

PDF

74.5 KB Created: 2021-09-01 05:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 339b7778c1544781add4b01790c87ef2 SHA-1: 705516ac7259a5e85e73b1c365102c4b3492abb2 SHA-256: ff61ed6a3891e7fc44e31c70f9ce29c4db3a9b3f0367048c95f5e2a6317c9706

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely leveraging T1566.001 (Spearphishing Attachment) for delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=hole+in+chest+dream PDF link annotation
- http://vstarmp.cn/upload/files/20210718_102648.pdfIn PDF document text
- https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ed30875e6---76609177589.pdfIn PDF document text
- https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b094c161ecc---pafofimekununewigiwifiko.pdfIn PDF document text
- http://jubileejec.com/userfiles/files/10523640196.pdfIn PDF document text
- http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1f412afc0---4627899320.pdfIn PDF document text
- https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986246e3ce2---ziwadosoka.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d52b48a215b---89311820042.pdfIn PDF document text
- http://occahomesearch.com/userfiles/files/sonowaketobemijevowumunik.pdfIn PDF document text
- http://areawifi.com/DESARROLLO/userfiles/files/vedabozabuwife.pdfIn PDF document text
- https://mehreganimaging.ir/images/upload/files/xutotogomo.pdfIn PDF document text
- https://instalacje-elektryczne.net/ckfinder/userfiles/files/57714993400.pdfIn PDF document text
- http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/gosax.pdfIn PDF document text
- http://derkwoo.com/upload/editor/files/samawemiluv.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/m4imr37dvn7erbolpgj4f3gpq5/78670266654.pdfIn PDF document text
- https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075922c0c4e2---91400123074.pdfIn PDF document text
- https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/5r59l5t82t9f5bkv83irsqaifi/2849343453.pdfIn PDF document text
- https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804cdaf1e3f---sijola.pdfIn PDF document text
- https://acronimocostanzo.com/userfiles/file/wolomavepav.pdfIn PDF document text
- http://gramercygrand.ru/files/file/vevigixabo.pdfIn PDF document text
- http://chiangmai-esc.net/user_img/files/worazaxa.pdfIn PDF document text
- https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eb32a4656---balemenatijejufexefi.pdfIn PDF document text
- http://litho-and-co.fr/ckeditor/upload/files/fipavaguromiburazuzofa.pdfIn PDF document text
- http://urgentcarepb.net/userfiles/file/laditapuzakesiwagigufeli.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8a64359c38502008454272caee277986/8510880606.pdfIn PDF document text
- https://cottonweb.net/userfiles/file/68403681892.pdfIn PDF document text
- http://www.toeterloeh44.de/files/96742603402.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_off0000c426.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC426	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dc38.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC38	15580 bytes
SHA-256: `1d937d8af97152376bfdfb65759beac86dd4049cf2dc9e42ce4a7e9914b57439`
`font_02_sfnt_off000103dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103DD	10628 bytes
SHA-256: `76786c4c1394735e35b271468d3a1855ed7197601bb55ee80751a0f55f79ae9c`

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