PDF malware analysis — malicious · 17201603a8a19ad4

MALICIOUS

PDF

87.8 KB Created: 2021-07-03 05:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: db617b0b5fac617163dfc7af4f12a80b SHA-1: b3028817df7ad9318088ca06b7e4085e1d5e54a4 SHA-256: 17201603a8a19ad439f6dccef3bc809a01c42a60a6054ec40341efc115e3749a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicating it functions as a link farm to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The document's structure and URL patterns are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://infrive.ru/uplcv?utm_term=summary+writing+for+4th+grade PDF link annotation
- http://thepokewave.com/uploads/files/kabuwilugujuwiganazaxo.pdfIn PDF document text
- http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd27265cdcc---1728571746.pdfIn PDF document text
- http://hurtmar.pl/Upload/file/21013116529.pdfIn PDF document text
- https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607524863bfd1---99453154676.pdfIn PDF document text
- https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/626a30b51f5c0a4e7ee06fdcc2a7fa7d/jikup.pdfIn PDF document text
- http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2e6567a45---pawakinetebet.pdfIn PDF document text
- http://cameralehiep.com/hinhanh_fckeditor/file/74841422015.pdfIn PDF document text
- http://hoacanh.net/luutru/files/83135922202.pdfIn PDF document text
- https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a877229785---32548440298.pdfIn PDF document text
- http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1d90b4f2a---lowunag.pdfIn PDF document text
- https://uniontend.com/userfiles/files/gegizubikolagari.pdfIn PDF document text
- https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/di13ps412nr56c9mg04082vael/95716316235.pdfIn PDF document text
- https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa382cf30c8---ramujipesaxovat.pdfIn PDF document text
- https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/7780a76cb3e3b377698d41ab5e6c6cc4/17747945542.pdfIn PDF document text
- https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/eiogn8doh5ubea20u11tehjuc4/54755432910.pdfIn PDF document text
- http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66201848035.pdfIn PDF document text
- http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075e2c515cfc---zitusarubivedobisipa.pdfIn PDF document text
- https://kurtoglumob.com/upload/file/41631136947.pdfIn PDF document text
- https://mfdesign.hu/files/file/xakadujej.pdfIn PDF document text
- https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/2f05d088b979e0140a66d98c0ccaf4fa/lakefifisake.pdfIn PDF document text
- http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/kovujuginemuw.pdfIn PDF document text
- https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7f99193e5---watosizujafupemirofigit.pdfIn PDF document text
- http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5f8971264---lezir.pdfIn PDF document text
- http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d62d856a0---99402503519.pdfIn PDF document text
- https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/bkrpb660t08f2tmdjha8csm852/podigosemunurize.pdfIn PDF document text
- https://travelsafeway.com/userfiles/file/44917854339.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_off0000f479.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF479	11040 bytes
SHA-256: `ebc8dd263c7b279eaadf51e25f42cc72da274e26f80707987253158166a87318`
`font_01_sfnt_off00010ded.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DED	17000 bytes
SHA-256: `e2764e0728b0b607b3536e277676596d2f566d506030093969274275edb7d4ff`
`font_02_sfnt_off000139df.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x139DF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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