PDF malware analysis — malicious · 436b47be6b8f0f5b

MALICIOUS

PDF

116.8 KB Created: 2021-07-05 00:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 7779f506e0a086c00b40947e90364937 SHA-1: 12b816002b37778dd269ae6c14bb4cfcba7fe0de SHA-256: 436b47be6b8f0f5ba4b595210b4d2737f9349db20f2607173e2509efae7bfdeb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9880

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://crysiq.ru/uplcv?utm_term=southern+university+of+science+and+technology PDF link annotation
- http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/ledolejazefik.pdfIn PDF document text
- https://canionglobal.com/FCKeditor/file/1458035197.pdfIn PDF document text
- https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/zubinejeweradusu.pdfIn PDF document text
- http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/cb042270145c9894faa1f44176b11352/39571932827.pdfIn PDF document text
- http://dejede.com/userfiles/file/13584792936.pdfIn PDF document text
- http://feuerwehrobrigheim.de/upload/files/50666724966.pdfIn PDF document text
- http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8753796578.pdfIn PDF document text
- http://mikailang.net/userfiles/file/20210501203711_147749030.pdfIn PDF document text
- http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bb6a49a01---29936605256.pdfIn PDF document text
- https://siam-royal-view.ru/data/files/91974622241.pdfIn PDF document text
- http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb71b4d27b---xojeratofadowiwomurujafon.pdfIn PDF document text
- http://sooclose.eu/upload/File/16735427548.pdfIn PDF document text
- http://precedent.by/_newsite/images_from_html_editor/file/7801206236.pdfIn PDF document text
- https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/008a7e65fc28918aafd4921740ceaf83/27287290331.pdfIn PDF document text
- https://prtl.pl/userfiles/file/91525202260.pdfIn PDF document text
- http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e4f4819a6---lapewuduwijuwafoxub.pdfIn PDF document text
- http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077715c134d8---bijifukupizoteso.pdfIn PDF document text
- http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0800ac666---74002582410.pdfIn PDF document text
- http://fundraisingwebsites.com/clients/9/96/963d931f30a9d2280975e71a7f923c96/File/95892532026.pdfIn PDF document text
- http://zonweringnederland.com/ckfinder/userfiles/files/68442660477.pdfIn PDF document text
- https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e803ae5b3---pisuserifumanasot.pdfIn PDF document text
- http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607347e63a46f---bedipixokuturexijiwifebi.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/da7074cb39098282b553b86ff15313d9/51432096002.pdfIn PDF document text
- https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/gqd110dh17paqv0p3b1o7j8dja/bisebekepedi.pdfIn PDF document text
- http://adabaskimerkezi.com/upload/file/26090666384.pdfIn PDF document text
- http://asianmosaicnyc.com/userfiles/file/dejesadadaridevomiforoz.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_off00016283.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16283	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00017a95.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17A95	18356 bytes
SHA-256: `b02502301c1280bdddea374d67f8579173a48d460564de5f2a0c290b9a54abb3`
`font_02_sfnt_off0001aa49.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1AA49	11112 bytes
SHA-256: `e228d915d2d9c97d5eb780895cc74dc9555d3caa6634238e9e3227ec4a91c142`

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