PDF malware analysis — malicious · ed248c0db4a33aa3

MALICIOUS

PDF

93.6 KB Created: 2021-07-04 07:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: b1e55addd6a65b521e6e4dc3d66d57de SHA-1: 9d54d98ae30e91a91d0c9dd2f6e3d3b33c0fce9e SHA-256: ed248c0db4a33aa320758eee242f2cc754e67f7e89d68c15fed205486bb2fba6

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to compromised websites hosted on disposable domains, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URI findings suggest it exploits PDF vulnerabilities or uses embedded JavaScript to redirect users.

Machine Learning

Nyx PDF Classifier malicious score 0.9932

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH

A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
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://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/80023156460.pdf In PDF document text
- https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7819622d10---11837172429.pdfIn PDF document text
- https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098e4a6ade62---17441631486.pdfIn PDF document text
- http://sp3siemianowice.pl/userFiles/files/72228552868.pdfIn PDF document text
- http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/44141380370.pdfIn PDF document text
- https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f5e1f2551760ba54c337e0f2671babcc/39383020069.pdfIn PDF document text
- https://hissekurban.com/resimler/files/23119192730.pdfIn PDF document text
- https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba6ae49c12---87785612202.pdfIn PDF document text
- https://actor-conseil.com/files/file/nalabokanu.pdfIn PDF document text
- https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/ba7bdda2dde3c5878899e85fb38439cc/74481432070.pdfIn PDF document text
- http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93725525143.pdfIn PDF document text
- http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609acb03c5a90---73831453028.pdfIn PDF document text
- https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607762aeab99c---7972793840.pdfIn PDF document text
- https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/1b7f21e1389cc0af75fee5840088461c/7532931096.pdfIn PDF document text
- https://alternativecarrepair.com/userfiles/file/karokixovexujolu.pdfIn PDF document text
- https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ac27c161---pobob.pdfIn PDF document text
- http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5bfee06de---gawupewotovejes.pdfIn PDF document text
- https://angel-juicer.com/FileData/ckfinder/files/20210618_A2CF01C785BDFBC7.pdfIn PDF document text
- http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3d7bbc3c---19261524289.pdfIn PDF document text
- https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/fe9k5ljl3v1kpmq73ut8vreuvv/2474062250.pdfIn PDF document text
- http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/458fhnhrhheduqs92k9271vkb6/visokitorerebugakepagu.pdfIn PDF document text
- https://karapinarinsaat.net/userfiles/upload/file/zutumagavogiwodamejateda.pdfIn PDF document text
- https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/e99b57eff3bd579f45683337e86e1dd7/pinobesupiteg.pdfIn PDF document text
- https://taxforce.nl/userfiles/files/fukuvimareneno.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=why+do+plant+cells+need+a+cell+wall+and+animal+cells+do+notPDF 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_off00010a48.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A48	17284 bytes
SHA-256: `aba19f68a995383d24b9d3479be35dd109a5f97d430945d5fe8c503b59f395ce`
`font_01_sfnt_off00013782.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13782	10872 bytes
SHA-256: `e77cbfb475061a60043d695f8875120a5b4ef590719905dca393e350c529ac45`
`font_02_sfnt_off00015087.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15087	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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