PDF malware analysis — malicious · 1b4692458e1a3aa3

MALICIOUS

PDF

74.9 KB Created: 2021-07-03 01:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 07f5e168d764bbdebaee80e00b23d3c8 SHA-1: 1f8d29878130fc4ef171e80de4449f4a5bde756e SHA-256: 1b4692458e1a3aa32a4adb0c710b794e1d53706e2ea043d5df7135f832162bdc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=inter+district+transfer+application+form+pdf PDF link annotation
- http://dnepropress.net/files/file/74859405374.pdfIn PDF document text
- https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/aea870fbd6fe8bfbdd493747c08e3056/zegigazuzupudegawojo.pdfIn PDF document text
- http://pizzeria-millemiglia.de/app/webroot/img/editor/file/togetelikonobonotebapeka.pdfIn PDF document text
- https://scriptdd.com/_file/file/soxemavutuxatakuf.pdfIn PDF document text
- http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90386ad7b8---80858844119.pdfIn PDF document text
- https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/g4kkiqbu8o6pmdhd0uac65pe7r/49194840806.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c5fd1f884---65834501491.pdfIn PDF document text
- http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a009c533d20---52086649572.pdfIn PDF document text
- http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087626e79374---pekofoguzo.pdfIn PDF document text
- http://amajyuku.com/files/files/napuzejazarewe.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dac3b4cfc---16075477520.pdfIn PDF document text
- https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086aaa112e5c---70317077579.pdfIn PDF document text
- https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/dd227bfa761c0da3bac4bf07645278dc/17357558244.pdfIn PDF document text
- https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/284bbab42c4adbc89ee48b301c63e2c9/soguvenomesezaxuvibarob.pdfIn PDF document text
- https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c532240b408---nefebux.pdfIn PDF document text
- http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16086981fdcbb9---85990808582.pdfIn PDF document text
- https://cristalensi.com/public/File/zuzojizoworawunafekatuj.pdfIn PDF document text
- https://socohoteldanang.com/uploads/image/files/216650924.pdfIn PDF document text
- http://elm3rad.com/file/33763272509.pdfIn PDF document text
- https://cleaner.pl/userfiles/file/xiruwanapimupo.pdfIn PDF document text
- http://parentini.it/userfiles/files/geniwapodopew.pdfIn PDF document text
- https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/aac92459a6b7bb1bc010a28883e03310/taxelapek.pdfIn PDF document text
- http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f57589a78---27193872970.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba126430c4---652014858.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_off0000c0a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC0A4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d8bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD8BB	10732 bytes
SHA-256: `a31c59fe9a354ccc1e02b814592b59ac02390d9ea4cbefd47afb46947345709e`
`font_02_sfnt_off0000f156.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF156	16512 bytes
SHA-256: `4faff01fef80e9903320d4bd3ee83f039adb0e99e103469314b9703b2334c535`

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