PDF malware analysis — malicious · 9a83de5c2db4f6fd

MALICIOUS

PDF

89.2 KB Created: 2021-08-11 00:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 9631e0e44525e0fd587994bb471cb465 SHA-1: 76820ea5512562cc0aa25b32da013c7e6be9e304 SHA-256: 9a83de5c2db4f6fd113dd12710080b58505c9b1be6a829207ae8957bdf58a935

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, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to lead the user to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9985

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 https://ladangmimpi.com/contents//files/pazonazozo.pdf In PDF document text
- https://machnhaduong.com/images/uploads/files/nevajakijuzebosiloromuf.pdfIn PDF document text
- https://matteagianotti.ch/userfiles/files/6144520237.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/82afca1930e08c5362c5eb3c0729cf69/zomodelu.pdfIn PDF document text
- https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811cef790b3---xumuwukawoxunomi.pdfIn PDF document text
- https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/06hndjeoi106prtd5fpbflll7v/76001589210.pdfIn PDF document text
- https://chmelo.hu/sites/default/files/file/vexexepidolopilogesobug.pdfIn PDF document text
- http://kaizenlife.com/ckfinder/userfiles/files/79205596996.pdfIn PDF document text
- https://universal4shipping.net/userfiles/file/79030454983.pdfIn PDF document text
- http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/01275a3381cace9dbae63bba61a227db/dibug.pdfIn PDF document text
- https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea1b465efe---2671113234.pdfIn PDF document text
- http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cf215f8da33---xotedubigimuwetapume.pdfIn PDF document text
- https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/bkjf292n4ab3223clli91u8dur/bezixakinul.pdfIn PDF document text
- http://unicaconsultoriarh.com/images/files/kanusebotapevejejenube.pdfIn PDF document text
- http://haverfordhigh77.com/clients/e/e7/e7c5a96ea35a64a1345a575153f12e7e/File/mubaziweviluzo.pdfIn PDF document text
- https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b39645daf2---kiwod.pdfIn PDF document text
- https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b10365a090a---40209598132.pdfIn PDF document text
- http://theartofdesign.nl/ckfinder/userfiles/files/95100456452.pdfIn PDF document text
- http://khiconghoixuancong.com/Khicong/admin/userfiles/file/potejusumanokipisemitopeb.pdfIn PDF document text
- http://www.firengo.com/userfiles/files/kefatewunulimasazoni.pdfIn PDF document text
- http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/susoxeme.pdfIn PDF document text
- https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/qbor38c1s8ipu52pb41v05npjk/91196166634.pdfIn PDF document text
- http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb624cf7b---senizesobometefezowoles.pdfIn PDF document text
- https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/lewekazexupid.pdfIn PDF document text
- http://chinalanpa.com/images/upload/File/98546452759.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=oxford+english+for+cambridge+primary+2+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_off0000f468.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF468	11556 bytes
SHA-256: `fdb95cfec85acc269769852561800fac1ca6c2f3f61d6cc67cad4c5eececd848`
`font_01_sfnt_off00010f47.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F47	17924 bytes
SHA-256: `5741c5c3026848bd925b7336e87c3063def2d7d2b8a4cd6d6fc09012ffbad8f1`
`font_02_sfnt_off00013dbf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13DBF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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