PDF malware analysis — malicious · 6bd0a533c44bec85

MALICIOUS

PDF

90.5 KB Created: 2021-08-12 04:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17

MD5: 9ac4a75c2cbe5e9da75b7f42dd6b771b SHA-1: 90b5acb5a143fa89064a7737d2d2441f43fafa96 SHA-256: 6bd0a533c44bec85b90f4c3844576f792243d64232488f0f2691ef71bdc8aa81

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs that form a link farm, pointing to various compromised websites and disposable hosting. These links are likely intended to redirect the user to phishing pages or download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9970

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://philabc.ru/uplcv?utm_term=interpreta%C3%A7%C3%A3o+de+texto+para+2o+ano+ensino+medio+com+gabarito PDF link annotation
- http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f33e41fc28---kovewazer.pdfIn PDF document text
- https://chandrakantmusicacademy.org/ckfinder/userfiles/files/23688908812.pdfIn PDF document text
- https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c6be1a382e0e5c7192054ab0dc2b3341/suluvezezifuw.pdfIn PDF document text
- https://airbays.com/userfiles/file/pamatufevazugojipap.pdfIn PDF document text
- http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d74f019e2---sorudozexagaregibuguleb.pdfIn PDF document text
- https://ekselantechnology.solutions/ckfinder/userfiles/files/gokotesixuxowukegebe.pdfIn PDF document text
- https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/5edbeeea4c654c2418c17191e58f4b78/sevimewewefemokabasixer.pdfIn PDF document text
- https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/9flh1frmln751liqrquv8l8sk5/50196651812.pdfIn PDF document text
- http://www.allatpatikapecs.hu/images/file/20271544026.pdfIn PDF document text
- http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814ad2094e2---98706718614.pdfIn PDF document text
- http://gramercy-grand.ru/files/file/10857131448.pdfIn PDF document text
- https://akbaturgame.com/calisma2/files/uploads/85484944716.pdfIn PDF document text
- https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609747811048d---48428200310.pdfIn PDF document text
- http://vssteel1999.com/ckeditor/userfiles/files/57315212038.pdfIn PDF document text
- http://juentai.com/userfiles/files/doxesinowixibovo.pdfIn PDF document text
- https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/53537cefadedaa3b02fc76bbab68fb12/sitaxifos.pdfIn PDF document text
- http://bukharajohnscreek.com/sites/default/files/file/3193566070.pdfIn PDF document text
- http://beiwendq.com/userfiles/file/luzalasezorejabobixokab.pdfIn PDF document text
- https://securitydm.com/slicice/file/desusexemokimusadapeg.pdfIn PDF document text
- http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/33533064643.pdfIn PDF document text
- https://abofahed.com/userfiles/file/pumidutunu.pdfIn PDF document text
- https://medicentrumnz.eu/medicentrum/files/file/94296475219.pdfIn PDF document text
- https://fullprotec.com/ckfinder/userfiles/files/faduzowuwi.pdfIn PDF document text
- http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16095a8cb2deb0---ganebosexutexubusolobi.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_off0000f650.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF650	19264 bytes
SHA-256: `f85a4f0e8c9bb8e56aba546b3f92f03d3e441f4d958f339d39817321f3b93b01`
`font_01_sfnt_off000124f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124F7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013d0e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13D0E	11588 bytes
SHA-256: `cb79dced670e746404b20c2a824213d203f778aaa8e1488fb41d5aaf20315742`

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