PDF malware analysis — malicious · ac48f72710c8efa1

MALICIOUS

PDF

70.5 KB Created: 2021-10-01 00:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 0288dcaf889d928eff468ad3e1bdfb09 SHA-1: 5405508ee49b3648ef82a6454397b276111e0438 SHA-256: ac48f72710c8efa1f5afe01cac1b42760de6df3bd6def9bdfb29cafbebdd5fa0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the document functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites and disposable domains. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

Nyx PDF Classifier malicious score 0.9849

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://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16145a115f28d7---22341804026.pdf In PDF document text
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156257ac9571---83235495827.pdfIn PDF document text
- http://expertsystemgroup.com/file_media/file_image/file/suwinigurunalof.pdfIn PDF document text
- https://accesoriosalmayor.com/images/userfiles/file/gotudibufajuwanezopini.pdfIn PDF document text
- https://www.larche-de-jules.fr/ckfinder/userfiles/files/81506825898.pdfIn PDF document text
- http://studioagronomoserragiotto.eu/userfiles/files/4646158750.pdfIn PDF document text
- http://gbfrjournal.org/pds/userfiles/files/xinap.pdfIn PDF document text
- https://eric-parnes.com/ckfinder/userfiles/files/29112120026.pdfIn PDF document text
- https://dolmalatrek.com/userfiles/file/4431281027.pdfIn PDF document text
- http://barrybusiness-crm.com/ressource/devis-photo/files/36119172202.pdfIn PDF document text
- https://2acontractor.it/images/file/17676795417.pdfIn PDF document text
- https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/kgogr92nv7g6al1voccgrrgkne/85907732826.pdfIn PDF document text
- http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbce54cfd3---31686052360.pdfIn PDF document text
- https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/a0e99478c10ce3b01e3fffb081ebf887/lobejawitowifizegapom.pdfIn PDF document text
- http://vipforiraq.com/userfiles/files/67548665031.pdfIn PDF document text
- http://medicare-darmstadt.de/bilder/UserImages/file/11161462178.pdfIn PDF document text
- http://alvitraders.com/files/36944018862.pdfIn PDF document text
- http://ysenb.kr/board/file/editor/file/5708259612.pdfIn PDF document text
- http://familiegravesen.dk/userfiles/file/84708785147.pdfIn PDF document text
- http://chanhungcorp.com/images/uploads/files/faxipimorupifanuvirar.pdfIn PDF document text
- https://fleseriuassociates.ro/files/file/kajadejox.pdfIn PDF document text
- http://abwalabamaave.com/uploads/files/sitobob.pdfIn PDF document text
- http://96stone.ru/userfiles/file/dagasamo.pdfIn PDF document text
- http://dierenwinkelindex.nl/images/uploads/nifawolejasegive.pdfIn PDF document text
- http://ural-resyrs.ru/data/file/kijitetek.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+i+listen+to+am+radio+on+my+phonePDF link annotation
- http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/regogibope.pdfIn PDF document text
- 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_off0000b1a9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB1A9	10848 bytes
SHA-256: `d1e86880be2d5674934ab9cc60198d396055406d6cce5a5f072ba93cc19aaf3e`
`font_01_sfnt_off0000ca7f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA7F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e291.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE291	16220 bytes
SHA-256: `661ac75f7c340102ee9ef5f9fed1f7bd9f1209718e1a5bca5896884963d49680`

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