PDF malware analysis — malicious · 6ab33d1fb776e07e

MALICIOUS

PDF

85.3 KB Created: 2021-07-18 12:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 4b0c7104471472d07875ecd2cada6f45 SHA-1: 5c4a74a16a23fa070af9ee389cce9fb5e3d96b2e SHA-256: 6ab33d1fb776e07e591dade9f8261ecca4e372795609763ad980fee7354b7894

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of these links and the overall structure strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://suamayin.biz/userfiles/file/53887961268.pdf In PDF document text
- http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609484277a262---98116202108.pdfIn PDF document text
- https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160acac074a779---42719712411.pdfIn PDF document text
- https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5961f0f0806361a3b3e08d9dddc5e647/86815275722.pdfIn PDF document text
- https://tcremich.lu/files/files/93836262105.pdfIn PDF document text
- http://1959blackshirts.com/clients/866684/File/89819717661.pdfIn PDF document text
- https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad905d8348a---90663624121.pdfIn PDF document text
- https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/f7fcf645356eed9fb06a9f6a5cca9ab3/deket.pdfIn PDF document text
- https://prestinireedcorp.com/userfiles/files/21510218181.pdfIn PDF document text
- https://anna-bel.com/app/webroot/files/userfiles/files/deginafakakixugavared.pdfIn PDF document text
- http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa05501326---14520860098.pdfIn PDF document text
- https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/34130e9c84c49aea82bb423670f0657e/41130949464.pdfIn PDF document text
- https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/9ea76a55d74af545769726b73a1630d9/51249178423.pdfIn PDF document text
- http://accessiblevehicleservices.com/userfiles/file/16671344356.pdfIn PDF document text
- https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094294967e74---bofirumexutuwopojulil.pdfIn PDF document text
- http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/liwemaduzixopelopo.pdfIn PDF document text
- http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f62347a6ee46cbdc309832b9ea963f90/pinugolujit.pdfIn PDF document text
- https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa81192bafe---dedamu.pdfIn PDF document text
- http://gardatrans.com/content/Files/nebinufodizot.pdfIn PDF document text
- https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/00urthsrotha1fc1b6p4jobng2/5432615293.pdfIn PDF document text
- http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c35ba61104---80201536479.pdfIn PDF document text
- http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160923b38d10ad---jixufogugilutul.pdfIn PDF document text
- http://otoozevran.com/resimler/files/wikuvekipu.pdfIn PDF document text
- http://interreg-ipa-husrb.com/downloads/daniludeg.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=hematology+oncology+specialistsPDF 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_off0000e9a9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9A9	10724 bytes
SHA-256: `1e0ad571d0ce78653470d1f83560d82aa6e68f77da3392135388598c171fa531`
`font_01_sfnt_off00010244.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10244	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011a56.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A56	17392 bytes
SHA-256: `e3b347e4243dda42c6e5236c7f5766670447faa384b453a29ba85ed337cb1889`

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