PDF malware analysis — malicious · 7a06e2995ec0fe39

MALICIOUS

PDF

75.6 KB Created: 2021-07-01 20:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: f8722d1845a8ef0a9a1a69c6f37a1a7b SHA-1: 67796104f4a411d50818c87430d840d456bac3c1 SHA-256: 7a06e2995ec0fe3933126d2bdc6570a63ff251d81070b537d351458d4d0d4b3b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous embedded URLs, many pointing to compromised WordPress sites utilizing the formcraft plugin for file uploads, suggest a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3662fef5b1---8924443888.pdf In PDF document text
- https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8d08e708d---karibobekiponu.pdfIn PDF document text
- https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609966eeed698---24561943929.pdfIn PDF document text
- http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430083258217808.pdfIn PDF document text
- https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/5t1dmbjdul1r6eddj5usd6thct/doraxemerapa.pdfIn PDF document text
- https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa8a79ddd8---12151561688.pdfIn PDF document text
- http://ncabhsa.com/clients/875427/File/2848612093.pdfIn PDF document text
- https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9a832e12b---rezogefalewunaligo.pdfIn PDF document text
- http://cheers-gifts.com/userfiles/52692202605.pdfIn PDF document text
- https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078204b907cf---tibejopixivuwawakeniba.pdfIn PDF document text
- https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/cbd3ded9df0c30a9277860882b87115d/51565195245.pdfIn PDF document text
- http://kirilmazbardak.com/userfiles/file/wutipugiguja.pdfIn PDF document text
- https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/3umskb2stjcod2d6db0f2jo701/tedaginusakiril.pdfIn PDF document text
- https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/vcanlo7bvesl1e7o09gk6qqe9i/movarewafij.pdfIn PDF document text
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071c7f2a485c---pakigewasuxibiwalakukob.pdfIn PDF document text
- https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/e36dc6a4e2293901323d2175d2d1fb07/fefibaxumokumiwi.pdfIn PDF document text
- http://accessiblevehicleservices.com/userfiles/file/70029508989.pdfIn PDF document text
- https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/8656ba1fbaa30d030dd4af35ae6cc193/60633310428.pdfIn PDF document text
- https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/uvg3boco3jum76odsofrs7r1g3/49327329867.pdfIn PDF document text
- http://belgium-ex.com/images/blog//file/gozomipimubalajajare.pdfIn PDF document text
- http://sportsgarten.com/editorData/file/51850330231.pdfIn PDF document text
- https://ckmandarin.com/uploads/77408864242.pdfIn PDF document text
- http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160756143543a4---suwolovapabatatarafivoka.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=duo+patisserie+%26+cafePDF 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_off0000c6b1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC6B1	17032 bytes
SHA-256: `56f51bdf4d13cf15d849e7bdaa08bb86d0364a824a40394ad1f6f941385bcc4e`
`font_01_sfnt_off0000f117.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF117	10196 bytes
SHA-256: `67100b011ca7ff69996003b1d78c6acf24e75335b8e1fa721a02d58448cdec58`
`font_02_sfnt_off00010826.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10826	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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