PDF malware analysis — malicious · a728c358325483a2

MALICIOUS

PDF

93.4 KB Created: 2021-08-20 04:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 4555f9de9e15c0196db8d64ecdcc6eac SHA-1: 27189a4572cd39c4fb6f344ce5b906a9ce40d091 SHA-256: a728c358325483a21a5df4159891e6d7a11cffa5766e8233d08a24884d00b328

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous links hosted on compromised WordPress sites, suggesting it functions as a link farm to distribute malware or phish users. No scripts were extracted, but the presence of embedded URLs and the link farm structure points towards a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

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://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc5eb846be---puxewaridob.pdf In PDF document text
- https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/98d0895dc81f7819f8cc6a1e228f7394/42160735736.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/unfav5imgkjmjeb9q93v8qibtp/saxexurerovaxa.pdfIn PDF document text
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/10be09a3f6327dff4da6c90322e0d154/nozaxusimipelejiwofitik.pdfIn PDF document text
- http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762926239d8---61894476779.pdfIn PDF document text
- http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b414c6884a---tojopegafes.pdfIn PDF document text
- https://amblamy.ee/upload/file/xegisozusetopefetexonofat.pdfIn PDF document text
- http://ippon.lv/uploads/File/kumom.pdfIn PDF document text
- http://unicorn-furnitures.com/d/files/wigifapoze.pdfIn PDF document text
- https://mayurherbal.com/userfiles/file/dekowevefosazagezek.pdfIn PDF document text
- http://dep14kirov.ru/userfiles/file/zupuwuvudamevepuviwiwar.pdfIn PDF document text
- http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c77951391---5888794811.pdfIn PDF document text
- https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16105914506992---66336885970.pdfIn PDF document text
- https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/0353ac31acb96b41054d642fe33f6226/86438691654.pdfIn PDF document text
- https://chp-travel.ir/data/file/41464927322.pdfIn PDF document text
- https://nnkcreations.com/userfiles/file/89880092576.pdfIn PDF document text
- http://zaintik.org/files/galeria/files/22527705977.pdfIn PDF document text
- http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c9ab78e2c---29666526873.pdfIn PDF document text
- https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/27636717581.pdfIn PDF document text
- http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b28fb3b85ba---tujopifulafapezazud.pdfIn PDF document text
- https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/0jmusa7ml48a6nma2tkreoeofo/2471212979.pdfIn PDF document text
- http://felixefontesadvogados.com.br/ckfinder/userfiles/files/89488910317.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/730c0748e710fb32c43a2fcd2462e601/61933467589.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=marvel+vs+street+fighter+arcade+romPDF 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_off0000f5bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5BC	4912 bytes
SHA-256: `6c1475211f47afc80de8573eeb8ff36a868c88c094d1527c828619e67a13adcd`
`font_01_sfnt_off000107d3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107D3	17112 bytes
SHA-256: `3ff108352d6c605f52a114677d655de0256e294090e3e7ddc8521ff6411af6af`
`font_02_sfnt_off000133f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x133F0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00014c07.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14C07	10880 bytes
SHA-256: `b049d74a5739fefa9c50304123b110c186904797f34fb8fa6c5b53312fd4b0e5`

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