PDF malware analysis — malicious · 5e8eb4ac8885b9e5

MALICIOUS

PDF

87.1 KB Created: 2021-07-06 02:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 8804025d8b1d0a9a522cb64e38872f03 SHA-1: ba5bb3bf58406e7b8bbcb713d6b9ef213849362c SHA-256: 5e8eb4ac8885b9e5dc91ac3e7a5e7103658c993196b2079a171224957e6c005e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into downloading further malicious content or submitting sensitive information. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or malicious redirection attack.

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://garglob.ru/uplcv?utm_term=gi+of+brown+bread PDF link annotation
- https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/9ic3bmrka6bp0poh0h4rus5ii5/88513899032.pdfIn PDF document text
- http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a0bff445943f0481dd841d2befa02cc3/lifikanoxexowojel.pdfIn PDF document text
- https://acronimocostanzo.com/userfiles/file/dofidamorigo.pdfIn PDF document text
- https://free-spirit-city.eu/uploads/wysiwyg/files/73038485062.pdfIn PDF document text
- http://tumwebthailand.com/ckfinder/userfiles/files/93761256532.pdfIn PDF document text
- http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609486b40bbd2---goruwulupojisimi.pdfIn PDF document text
- https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/a8bd9fc7e8d9b4eff22de4a932826da5/16851763862.pdfIn PDF document text
- https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/jgl9ql4nctia211qlbcs2bks6t/solanoludujekuku.pdfIn PDF document text
- https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1e62c19c6---27107177589.pdfIn PDF document text
- http://eurekaelearning.com/upload/news/file/30886594250.pdfIn PDF document text
- http://sjar-tech.com/uploadfile/file///2021060910214621.pdfIn PDF document text
- https://bouwservicewinthagen.nl/userfiles/image/file/22573337371.pdfIn PDF document text
- http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/budepepomemuse.pdfIn PDF document text
- https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cd1967de5da56d8aa8f00988de9e7170/madamevenefoguditaxog.pdfIn PDF document text
- http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a2762c0d---92667221668.pdfIn PDF document text
- http://sapaethnic.com/webroot/img/files/jegotejewagama.pdfIn PDF document text
- http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d9fa59a32---14197366210.pdfIn PDF document text
- http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a993d2dd---64529725494.pdfIn PDF document text
- https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823283a1555---50680051736.pdfIn PDF document text
- https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/44a29e66fbe174264483d3dde3e75c0b/93535439772.pdfIn PDF document text
- http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088749deaaa5---rowunubiniwezov.pdfIn PDF document text
- http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160922b2bdf4dc---58463624816.pdfIn PDF document text
- https://ksboutlet.com/file/files/zudorinizizunad.pdfIn PDF document text
- https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/aecee7ab93fa382f10e8aa4ce881d229/73091701794.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_off0000f402.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF402	17468 bytes
SHA-256: `c00ce68cd8aab656a6914f736f2b6a2357c3b7fe7c12375dabff3292050217d7`
`font_01_sfnt_off00011fe8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FE8	10300 bytes
SHA-256: `5cc2c344bd4adb79243a42eb113c916fcb2b8d4758e9abc5d57eb9c1a35ef082`
`font_02_sfnt_off00013743.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13743	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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