PDF malware analysis — malicious · e2332786d9ee6797

MALICIOUS

PDF

85.6 KB Created: 2021-08-04 11:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: f76c64aca359adef8e227ebbbbabedc3 SHA-1: f5bdd6018d1de36c4c503d1e7a99c2e764fa95da SHA-256: e2332786d9ee6797ab5c1253f13b8b1dc652ab5eca9cefd4348a63b2f2e394f3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised websites. This suggests a multi-stage attack where the initial PDF serves to redirect users to further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://htwy.com/upload/file/wijazewobufuroda.pdf In PDF document text
- http://calzaturificiocatia.it/userfiles/files/junegenejaniros.pdfIn PDF document text
- https://cometsecurity.in/admin/userfiles/file/52874010351.pdfIn PDF document text
- https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5c4ba9621---sivixenubefununeles.pdfIn PDF document text
- http://panziofabian.hu/fck_kepek/79606055564.pdfIn PDF document text
- http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/2588db635aa82ab63973f4d61b92ec07/mevolenodetaliwu.pdfIn PDF document text
- http://eviinstall.com/userfiles/files/10360487025.pdfIn PDF document text
- https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0be3daf313---7468528543.pdfIn PDF document text
- https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/ef94721119066f14dd602caf510215d0/2738714294.pdfIn PDF document text
- http://bjsixiang.com/jingkelun/userfiles/files/20210624161757.pdfIn PDF document text
- https://grup-insaat.com/userfiles/file/nugufinafebiwogab.pdfIn PDF document text
- http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e677ef5ae7c---vipadulufaninudesopap.pdfIn PDF document text
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/diuhv5skeedhm812j41l0jd09s/rapikotasidi.pdfIn PDF document text
- https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/3a6b7410055dc87d5baa2bafc594e981/71486614423.pdfIn PDF document text
- https://amitadevnani.com/userfiles/file/gekuxixi.pdfIn PDF document text
- http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/5e3bfabddc9a5526dcca1896d0e435c5/gipujalowoxar.pdfIn PDF document text
- http://asvpp.fr/pdf/92595467826.pdfIn PDF document text
- https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7a7fb8218---watiteze.pdfIn PDF document text
- http://sswjeans.com/files/fukipejegegado.pdfIn PDF document text
- http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccfeaa7478---2181965932.pdfIn PDF document text
- https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac08a659c---tutajetavemapusakibezijo.pdfIn PDF document text
- https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607495be414d5---zonunavipaderuf.pdfIn PDF document text
- https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc7e6c58b0a---90269814992.pdfIn PDF document text
- http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4005185a86ee3758af158f2bf4422df0/55081895494.pdfIn PDF document text
- https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a4d6db8c0---tuzisobogunajenu.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=1+decimetro+cuantos+centimetros+tienePDF 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_off0000e6d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6D5	10540 bytes
SHA-256: `76d769b794720fc32c631d5a28bb0ebd2a73101b5599825978dc4f942ca3fbe3`
`font_01_sfnt_off0000fed2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFED2	18724 bytes
SHA-256: `d47bfbeeb08c69904723ca7ccb968ffc652080d1989308f0c188f0206485eda5`
`font_02_sfnt_off00012ed3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12ED3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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