PDF malware analysis — malicious · 49d9407b497a06cb

MALICIOUS

PDF

89.1 KB Created: 2021-09-21 21:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: c27db06b114fa5b3455f6f33b9438e2a SHA-1: 47d5011840429d668d8100b7871c146b98136c95 SHA-256: 49d9407b497a06cbabf5d42c95c807fc6649033fb2ca8b86f0e7d69b02d5f8d4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload storage, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

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 http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bcfaa963c---zenijevipituxuvewuzem.pdf In PDF document text
- https://alsharqcc.com/userfiles/files/69381188919.pdfIn PDF document text
- http://smartdeal.pl/files/upload/files/mojujowunuborutavewatu.pdfIn PDF document text
- http://abw10thstreetne.com/uploads/files/57596263370.pdfIn PDF document text
- https://tomorrowhubs.com/upload/users/files/6981464203.pdfIn PDF document text
- https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/vfo848rpa0okmllvjmj44lir0h/7839281217.pdfIn PDF document text
- http://www.farmaciapenil.es/userfiles/files/tigel.pdfIn PDF document text
- https://barcelonacentremedic.cat/files/galeria/files/suzotorepokuzefowiwif.pdfIn PDF document text
- http://holdemigny.fr/ckfinder/userfiles/files/73106895709.pdfIn PDF document text
- https://songhong.info/userfiles/file/52166105998.pdfIn PDF document text
- https://harteron.ee/userfiles/file/bumekasuxejugekop.pdfIn PDF document text
- http://twfindia.in/userfiles/files/14583291335.pdfIn PDF document text
- http://korealabels.com/ckfinder/userfiles/files/rivebesaritunivudad.pdfIn PDF document text
- https://mexico-airport-transfers.com/ckfinder/userfiles/files/19655931298.pdfIn PDF document text
- http://grupposcorcia.it/userfiles/files/80795021753.pdfIn PDF document text
- https://ht-cooling-j3t.com/contents/files/16863149349.pdfIn PDF document text
- http://ichieh.tw/uploads/files/202109032328302730.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141181916780---30249358382.pdfIn PDF document text
- https://prosaison.fr/userfiles/files/xokodiwotezuve.pdfIn PDF document text
- http://roycraft.ca/userfiles/file/26399174490.pdfIn PDF document text
- https://stealthwindow.tw/uploads/files/202109011347163906.pdfIn PDF document text
- http://www.europesolidaire.eu/userfiles/files/tawupotenukipizakoranela.pdfIn PDF document text
- https://tidymoney.com/ckfinder/userfiles/files/63858734650.pdfIn PDF document text
- http://yourhandmadeitems.com/userfiles/file/30443960052.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=one+ui+3.0+a51PDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dbc3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBC3	17764 bytes
SHA-256: `d7d5555757459761ce22946eecf9a66e0541067581867da0422ff259af1e5242`
`font_01_sfnt_off0000f68d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF68D	19048 bytes
SHA-256: `fc7b1ee84b0f416c90c4b11b9b6f0d0a3acf3ffd91574a7aa4a119d2277da660`
`font_02_sfnt_off000127b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x127B0	10240 bytes
SHA-256: `34bf87c51abde1003c65999030e48dd74664c89cac45b017ed0ef28f68b14d3b`
`font_03_sfnt_off00013edb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13EDB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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