PDF malware analysis — malicious · 2a63dbc3bbb235f9

MALICIOUS

PDF

86.1 KB Created: 2021-07-13 19:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 30856b8a37e25306e9dd4ab2821f5bdb SHA-1: 4447df2c0d5e65f270b272e9728ee75a36ba1d37 SHA-256: 2a63dbc3bbb235f9ef1248aa2d4855d60928d1d7af155311997b431f2989fd0a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and link farm structure suggest the primary goal is to redirect users to malicious websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

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://inwebjor.ru/uplcv?utm_term=archdiocese+daily+mass PDF link annotation
- https://stdtekstil.com/upload/ckfinder/files/94638458179.pdfIn PDF document text
- https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f3cce9301---zanubogadewi.pdfIn PDF document text
- http://beiwendq.com//data/attachment/file/28051369618.pdfIn PDF document text
- https://caribemed.com/userfiles/file/9069723894.pdfIn PDF document text
- https://33mobility.net/uploads/files/33394907634.pdfIn PDF document text
- http://kochamsushi.pl/UserFiles/file/946581805.pdfIn PDF document text
- https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806f19af427---95909730206.pdfIn PDF document text
- https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/0943120cac77dd33bb86c873a6e8a099/bobizanadapuderut.pdfIn PDF document text
- http://wwstationery.com/files/file/52373743083.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce75b47b58---jegexadabegosazuzujerifi.pdfIn PDF document text
- http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e54040d7399---82972760839.pdfIn PDF document text
- https://advantagelic.com/singhania/downloads/file/78751326837.pdfIn PDF document text
- https://fultoys.com/userfiles/xakanidivapikojuwatagol.pdfIn PDF document text
- https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/nkg5a7sn7emnhnl474s8utnk4u/siwuzifatisusateju.pdfIn PDF document text
- http://innotec-industrie.be/userfiles/file/gonitiparugitafi.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ecf56a0eb---galukakarotinapon.pdfIn PDF document text
- http://wu-pao.com/upfiles/editor/files/rukoduvukogijikigusizi.pdfIn PDF document text
- https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/c2175j1agb1k4qvr1qifi9e77o/dumixatorutoxawipuzugivuz.pdfIn PDF document text
- http://fogathajtohirek.hu/fckfiles/file/18122736942.pdfIn PDF document text
- https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcd45dfb56---sonaxapulegewovalira.pdfIn PDF document text
- https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e47b3c885---90047269682.pdfIn PDF document text
- https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/03232f08e83022a1f6222e35a4fd1358/84008953909.pdfIn PDF document text
- https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d67ffee5b66179493fbbd22ed8a37e84/laremibagaketu.pdfIn PDF document text
- https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/d07bls8ms9tr86dso1s403doq4/21280206467.pdfIn PDF document text
- http://spamsmsgiare.com/media/ftp/file/fodak.pdfIn PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/sn2ap51puv3lbfs78d7l7p7c37/tasiwubovijabariv.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_off0000ed7b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED7B	17488 bytes
SHA-256: `a6f2b9fb85921a362d7974f2c8b48173c93a48c4b84f5dd9c8d9a1116f2937bf`
`font_01_sfnt_off00011aed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11AED	10528 bytes
SHA-256: `0488193c430f2719bc5513dd64a1781b69c4149783e63e5be155dadb7e381902`
`font_02_sfnt_off000132ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x132EA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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