PDF malware analysis — malicious · bf9dffd59807644b

MALICIOUS

PDF

86.5 KB Created: 2021-07-16 20:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: e83b010700adeee9be262fbe0f8ab34d SHA-1: 7ff57765bd358001adc55ed463f5a6b680c986ec SHA-256: bf9dffd59807644b7e18be5576d661a8b2b4eec1ed405abd7cd62966cbafea3e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to malicious content or phishing pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://harkakotony.hu/UserFiles/file/73393598640.pdf In PDF document text
- http://dalboncostruzioni.it/userfiles/files/88416842776.pdfIn PDF document text
- http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/95h19qg1eeq8ao9tq7kjf96b5c/nenefesibulakumunepuzoso.pdfIn PDF document text
- http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b13f0f0e47---54203202592.pdfIn PDF document text
- https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/9b37459c48f78a1f5aa7976f2e9084c2/18912003076.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e98078e2834---zawijifetufepibiwi.pdfIn PDF document text
- https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/04e9f6121e7c869fcf9c9ce390cda0b9/jufigejiboxakifunewexumik.pdfIn PDF document text
- https://eviinstall.com/userfiles/files/52997233029.pdfIn PDF document text
- https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/1499be61e24daf02dd40724db52f2a71/foraf.pdfIn PDF document text
- http://shipagents.nl/uploadfiles/file/menudoxeve.pdfIn PDF document text
- https://samsungklimalar.com/upload/ckfinder/files/70155043441.pdfIn PDF document text
- http://beta-rc.com/upload/files/vusasenedesifef.pdfIn PDF document text
- http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e909b636a---tidowagomele.pdfIn PDF document text
- https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4a80351b9---kakijaviluvu.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4354e74d26---gunoroxofakawe.pdfIn PDF document text
- https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/1cff182e65377ae6dd82721d196dcfe7/80953829421.pdfIn PDF document text
- https://aiaciran.org/cache/fck_files/file/joragodudofizurone.pdfIn PDF document text
- http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7ec3a0c24---3064727687.pdfIn PDF document text
- https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/526ca29d95955d58bc1c49828814160d/41986279677.pdfIn PDF document text
- https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/25022048ddc1576c5247e77ced751915/xekuxizopusananuvu.pdfIn PDF document text
- http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086ef71eeb5e---wazimikusufopigu.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ed1c4d86e6fbd914270f4fdb8c67fa8f/59741242391.pdfIn PDF document text
- http://efrex.cz/files/file/28613686004.pdfIn PDF document text
- http://j1medical.com/uploaded/file/41014646589.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+put+two+scanned+images+on+one+pagePDF 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_off0000efb2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFB2	16928 bytes
SHA-256: `2bfc2eb26bead4649bde9a90f544ecf655f141688b18b2b8197617d5e389698f`
`font_01_sfnt_off00011b9c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B9C	10888 bytes
SHA-256: `ca24c3e64c1c0e5edfcb5eedddc5c10406374e881c005bc27e1f02413a472ad0`
`font_02_sfnt_off000134a5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x134A5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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