PDF malware analysis — malicious · c5e2b44901d2a8a7

MALICIOUS

PDF

72.0 KB Created: 2021-09-03 09:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: a7e256f5a0cfd3347b75940f8523bbc0 SHA-1: c4e2aa145970d181c03eba1088859cb80ac9c6e2 SHA-256: c5e2b44901d2a8a7f3f564f279d3d062de62d9b517e1f5c79af6f2b36608151f

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised or disposable domains, likely intended to lure users to phishing sites or download further malware. The presence of multiple PDF link farm heuristics and embedded URLs supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.8257

Heuristics 5

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
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://bunny888.com/ckfinder/userfiles/files/tikamivimivezu.pdf In PDF document text
- https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3ffa9b90f---72889655455.pdfIn PDF document text
- http://goodfortune.hk/UpLoadFile/file///47957641372.pdfIn PDF document text
- https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/dc26422e4b7a7a820d7590769d4290c5/70195431735.pdfIn PDF document text
- https://akrmedia.no/ckfinder/userfiles/files/98116683185.pdfIn PDF document text
- https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad4a0e21ec---4496052651.pdfIn PDF document text
- https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/9jfgpv8egsqjju7pg5vgudusv6/31704284235.pdfIn PDF document text
- http://ridendo.cz/files/file/nunoxulup.pdfIn PDF document text
- https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fc1ac54e7---fusijevodepu.pdfIn PDF document text
- http://dogalakustik.com/depo/sayfaresim/file/majewurur.pdfIn PDF document text
- https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/519d291ab1fc1d54e908342f9a6921d9/7284331064.pdfIn PDF document text
- http://dalnoboy.net/data/filestorage/upload/files/suteguzuduvofevabumuf.pdfIn PDF document text
- https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ade17fcc5---30155435287.pdfIn PDF document text
- https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0112206279---gilefaketitebixa.pdfIn PDF document text
- https://ms01bet.net/contents//files/86238884282.pdfIn PDF document text
- https://apotekatia.ba/fajlovi/30624741964.pdfIn PDF document text
- https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/jrbbu415memfv08esmlufp5e2l/datojumafonabazisipuboboz.pdfIn PDF document text
- http://decom.pro/admin/ckfinder/userfiles/files/vafatamawabinede.pdfIn PDF document text
- http://ebbers-schilderwerken.nl/uploads/files/98769187082.pdfIn PDF document text
- https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5eec8d8298---46667180273.pdfIn PDF document text
- http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8ef14fe98---gufobujopuloj.pdfIn PDF document text
- http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/29816351926.pdfIn PDF document text
- http://sakem.org/userfiles/files/tifadesojogupipubazufis.pdfIn PDF document text
- https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161107a78905c3---logeduk.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ielts+writing+band+9+pdfPDF link annotation
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000daa2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDAA2	17732 bytes
SHA-256: `ff94ca9406ca76b2e8c547c974036c17cc3b8b3e9bf1025ca637bd702a84e3c5`
`font_01_sfnt_off0001074b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1074B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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