PDF malware analysis — malicious · 54ff15e26f69977a

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 03:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 611002b34078a8ef4df8f7ffbb1e4050 SHA-1: f5ce366fea908df0a34d32362031323aa265cd46 SHA-256: 54ff15e26f69977aaf585158bdeca131d64c7432c723e1b89325d8c67a19f133

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggest a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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=possessivpronomen+uebungen+pdf PDF link annotation
- https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ea98a0ae3---toxuwamaxonor.pdfIn PDF document text
- https://medtek.vn/storage/file/92679368376.pdfIn PDF document text
- http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609293ded7569---18195522290.pdfIn PDF document text
- https://nic-irq.com/userfiles/files/dekig.pdfIn PDF document text
- http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ee45e4ba1bc---gatetemusoxufoveg.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea5cc1b6c---34116324374.pdfIn PDF document text
- https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/b5p6qg6mbbegpl1eqhot36j646/lavonakirelo.pdfIn PDF document text
- https://grup-insaat.com/userfiles/file/12648207918.pdfIn PDF document text
- https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0335901e9aeadaa4556c9ba5a6ddf8a7/16121135957.pdfIn PDF document text
- http://newtrichur.com/userfiles/file/83965118177.pdfIn PDF document text
- https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d679549773a8d66606c65fc1567ecd1f/fexitutulogizefakarifovox.pdfIn PDF document text
- https://h1t-url12shio-turbo.com/contents/files/tugonixajuzi.pdfIn PDF document text
- https://webshopplus.nl/app/webroot/files/userfiles/files/76454277487.pdfIn PDF document text
- http://stihoplet.by/upload/editor/files/sivufa.pdfIn PDF document text
- https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/bfe6737943c10674a03a45a68253cf7b/nizaze.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a973ef57d61---20203823372.pdfIn PDF document text
- https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/1de6fd5002659e6063400c21e6c637b3/sozuxajitiradolifamonomu.pdfIn PDF document text
- http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b05e78fb3---84499093764.pdfIn PDF document text
- http://qkmedica.com/uploads/userfiles/file/90483952346.pdfIn PDF document text
- http://kukdae.com/files/fckeditor/file/kozoxotipuxalafewofufinal.pdfIn PDF document text
- http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608760889c64a---fosevunefefukilalotowefi.pdfIn PDF document text
- http://lezeckastenakosice.sk/upload/files/43653776871.pdfIn PDF document text
- http://espaciocultivarte.com/ckfinder/userfiles/files/dapaparojuvevuniwulufane.pdfIn PDF document text
- http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/1q16ij5aoqdipnbkj6f05ese70/morikapozinalarobojisaba.pdfIn PDF document text
- https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/deb8fd97abd97eab4f0e7a063b3dddc7/gavesemisodilezeku.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_off0000d733.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD733	19652 bytes
SHA-256: `81bb89da739fb48e51fe0f703cfc3dafda2e5ec176890952ca7865aac477838b`
`font_01_sfnt_off00010913.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10913	10840 bytes
SHA-256: `1cc25c006f2f53945c035c9ba4ed569b3f189458652c96b64eef7d0f8dc09649`
`font_02_sfnt_off000121b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121B0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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