PDF malware analysis — malicious · 3f5af5da40dc0c20

MALICIOUS

PDF

91.0 KB Created: 2021-06-28 00:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: faa65185de5a5f1417bcf497468c8088 SHA-1: 230903f8d7445aa197f92f941fa0770215f0cb31 SHA-256: 3f5af5da40dc0c2065fed7d153c640f92b9773e59e4c78aa9224efb5f8d0e0e7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting, forming a link farm. These links likely serve as redirects to phishing or malware distribution sites, indicating a phishing or credential harvesting attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b07800eae8---bitijoxufitaz.pdf In PDF document text
- http://altaprecision.com/userfiles/file/webifusubetejapisibek.pdfIn PDF document text
- https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f687c25b13---9097424989.pdfIn PDF document text
- https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/a998dbb61fbf6e7bdd0c54fe327ac697/15893285436.pdfIn PDF document text
- https://aawyx.com/sites/default/imageuser/file/jitulebizerimura.pdfIn PDF document text
- http://mega.kz/media/upload/files/50939560820.pdfIn PDF document text
- http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b43568a3fd4---82185629307.pdfIn PDF document text
- http://www.kammerpop.de/files/file/nekibanuzojigome.pdfIn PDF document text
- http://bbpcosmetics.com/admin/upFiles/2021-5/file/nifujarinuzefebufijalake.pdfIn PDF document text
- http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866bf91118e---66928041961.pdfIn PDF document text
- http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8a178d2da---nusidemelomina.pdfIn PDF document text
- https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/65358c48f6ef7bb37cb236132f5ba654/88291187196.pdfIn PDF document text
- http://turagent007.ru/userfiles/file/rirezibikezeworijubupim.pdfIn PDF document text
- https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/e6212f81836e567f1f2346fb0b6e75b8/mawutezejubavavujujozuzo.pdfIn PDF document text
- https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/00aa3600e011099aff5a372d593f2d74/6872822808.pdfIn PDF document text
- https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ab29bfa93b240c6a285a03a839cb48ff/namasasifeg.pdfIn PDF document text
- http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfab1f96801---jilokutubifaguxiw.pdfIn PDF document text
- http://kistours.hu/userfiles/file/kipowotutun.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4c5db050646b1154842439effbc1d7a5/67969528477.pdfIn PDF document text
- http://ldbell1965.net/clients/85689/File/wubilirawidofe.pdfIn PDF document text
- http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb87bd66f0---kemaloxokige.pdfIn PDF document text
- https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981c6393671---solelir.pdfIn PDF document text
- https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/8k3vllns734qpecajmak86jm30/mepupenesopigariziro.pdfIn PDF document text
- http://circolosilverblufitnessclub.eu/userfiles/files/27247611022.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=best+army+coc+th8PDF 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_off0000fe81.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE81	10628 bytes
SHA-256: `e8a6be53cea7a601c29f30ea27f39dc06edcd636bd0d9d8ab6331886abc579c0`
`font_01_sfnt_off000116f4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x116F4	18332 bytes
SHA-256: `ec66fc10cd441eea7dcf8065aafbd0e078a8f17e72283f4598b19648006d2527`
`font_02_sfnt_off00014732.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14732	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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