PDF malware analysis — malicious · c8d35035ea451624

MALICIOUS

PDF

105.5 KB Created: 2021-09-06 10:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 7064537c389724fcead652c9968e3035 SHA-1: f23c3394d0c08de3cea467de81a9aedb3160f849 SHA-256: c8d35035ea45162495046d2c8becbae2fb07a209f959dbb62681dd02cd038e66

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or direct downloads of other malicious files. The presence of these links suggests an attempt to lure users into downloading further malware or visiting phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9867

Heuristics 6

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
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://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/ripoles.pdf In PDF document text
- https://immobilgold.com/file/39450413197.pdfIn PDF document text
- http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a565a6c33---36913890458.pdfIn PDF document text
- https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b3e0242038e2c1f096a8dc78e9d7531c/fidewunumaxesebila.pdfIn PDF document text
- http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/ltf6tnngr05ud6vludjns2u4b7/78654097494.pdfIn PDF document text
- http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/kaft54uvrv444f9opudbcq8ifk/81362758213.pdfIn PDF document text
- https://ebooksweb.net/files/file/gatajapek.pdfIn PDF document text
- https://catbasailing.com/upload/fck/file/zagasodojufu.pdfIn PDF document text
- https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/3b40427dd8b672e7cbe1afc69f33f9d7/kevedexujememum.pdfIn PDF document text
- https://n-v-v.dk/userfiles/file/92036962306.pdfIn PDF document text
- http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/vuxuri.pdfIn PDF document text
- http://piemonteforyou.it/userfiles/file/dutipo.pdfIn PDF document text
- https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/104b05ef586db27554764f235cb26f13/3522856611.pdfIn PDF document text
- http://studiolegalebisantis.it/userfiles/files/gifasejifubalagolejexesu.pdfIn PDF document text
- http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe0bd55eea6---dajav.pdfIn PDF document text
- http://sanarina.de/ckfinder/userfiles/files/losodonixajodixaguxa.pdfIn PDF document text
- https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/16bcb2189ac22e1120c34860eb00573a/dodegugifakorugekigatitav.pdfIn PDF document text
- https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b0af9c61e---nilewebaje.pdfIn PDF document text
- http://mamnonlittlesun.com/upload/files/11926653856.pdfIn PDF document text
- https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f8274e3c936---24932200461.pdfIn PDF document text
- http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086637cb98e2---24169889080.pdfIn PDF document text
- http://winfielddeli.com/ckfinder/userfiles/files/vosekotog.pdfIn PDF document text
- http://kyanite.tv/userfiles/file/bavabizupixufifuwotuzeg.pdfIn PDF document text
- http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5527754bea---52888164624.pdfIn PDF document text
- https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5842ae89f1d29faa4156f52088d21224/genuzerabegojowejoxa.pdfIn PDF document text
- http://remobudostol.pl/pliki/61611374898.pdfIn PDF document text
- http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160792b9906def---lutef.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=swipe+to+unlock+book+pdf+free+downloadPDF 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_off00013237.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13237	19648 bytes
SHA-256: `63fc01cc38d4e3bcb885e81cdfb92afff16870034171a740d6d5a542e6b60149`
`font_01_sfnt_off0001660c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1660C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00017e23.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17E23	10936 bytes
SHA-256: `eecb0bfcfef985f724555d2df428632633e2d7384aba3028c4984b822cdde886`

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