PDF malware analysis — malicious · 3213578e20e1ce72

MALICIOUS

PDF

84.8 KB Created: 2021-09-16 05:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: ba95c2ff3708913e5f7ab998ea1d699d SHA-1: b7525a4b892f07932acf0451f7fff5f5a550077c SHA-256: 3213578e20e1ce72978907e807615d3b63e3f0fbc09452d61e6c3b4e4c07451c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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://tinhdauvietnam.vn/upload/files/16760967922.pdf In PDF document text
- http://kanalizace-ul.cz/userfiles/file/pelusomolowupomon.pdfIn PDF document text
- https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/9ff54c37d3072cfb7bb6f84243df3581/21779327491.pdfIn PDF document text
- http://babywagen24.de/userfiles/file/rijidugujalarom.pdfIn PDF document text
- http://skipjackpoke.com/ckfinder/userfiles/files/30591833395.pdfIn PDF document text
- https://gmnavarra.es/ckeditor/files/kebemuwuvale.pdfIn PDF document text
- http://skomi.ru/img/files/file/6431381852.pdfIn PDF document text
- http://zhymwz.com/upfile/file/jadajufuzakinokogotenige.pdfIn PDF document text
- http://bajkolandia-leszno.pl/userfiles/file/946458396.pdfIn PDF document text
- https://www.truck-transport.com/ckfinder/userfiles/files/68320881233.pdfIn PDF document text
- http://fermobkorea.com/userfiles/file/20210905210144.pdfIn PDF document text
- http://gerd-pollak.de/userfiles/file/38230724880.pdfIn PDF document text
- https://holcom-wd.holcom.vn/webroot/img/files/mazebuxivegaloniwisivaka.pdfIn PDF document text
- http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39978075123.pdfIn PDF document text
- https://0900107678.com/upload/file/zodemu.pdfIn PDF document text
- http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/buxasadaduvefukasa.pdfIn PDF document text
- http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/lulipevovat.pdfIn PDF document text
- https://perfecthospital.net/FCKeditor/file/48993843618.pdfIn PDF document text
- https://motty-etai-sharon.com/files/files/gugomefavarisebile.pdfIn PDF document text
- http://facilitymanagementassociates.com/survey/userfiles/files/80006774465.pdfIn PDF document text
- https://sitpchemcieszyn.pl/_sitpchem/file/41134305148.pdfIn PDF document text
- https://marljivo.hr/UserFiles/files/56458488540.pdfIn PDF document text
- https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/33c1cd5aa9ae4caec8f8a5e3f55a1b8d/susulasig.pdfIn PDF document text
- http://giprozdraw.ru/ckfinder/userfiles/files/majemivilumu.pdfIn PDF document text
- https://tomorrowhubs.com/upload/users/files/91415174944.pdfIn PDF document text
- http://newo.ru/files/files/79684151380.pdfIn PDF document text
- https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613df43f145a0---nutedifevagil.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=best+anime+dating+games+for+androidPDF 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_off0000e6b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6B3	17708 bytes
SHA-256: `181b538d41f10565397147409ca8332afc8db4f6d3476cc1f3f6f439ce41774b`
`font_01_sfnt_off0001149a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1149A	10704 bytes
SHA-256: `d0d6ce10b5481e3900901a9748f23216cd19439905b5357ebd05cb9518619d9a`
`font_02_sfnt_off00012cfb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12CFB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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