PDF malware analysis — malicious · d1cfd823b757eed3

MALICIOUS

PDF

71.4 KB Created: 2021-09-07 13:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 7a2033c279e5153d2effe2dff9740fa0 SHA-1: 118d808ad4dadfc22b85331ceb4c575a52511efc SHA-256: d1cfd823b757eed3dc0496348dc5bd1e96dd927841646d5eaacad563ffca7dfd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

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=iadt+dental+trauma+guide+pdf PDF link annotation
- http://absolutelyneon.com/userfiles/file/16787276423.pdfIn PDF document text
- http://dongtienlamnghiep.com/upload/file/64197665599.pdfIn PDF document text
- http://castrolmintabolt.hu/images/upload/file/vuxil.pdfIn PDF document text
- http://infunplastic.com/d/files/rumagopunewap.pdfIn PDF document text
- https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/bikl9fqc510dun5709b7c1fqo5/geludisutozibet.pdfIn PDF document text
- https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16120c5c6de813---2656032363.pdfIn PDF document text
- http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed35ff3a15---36932167886.pdfIn PDF document text
- http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/uklq8clikto14s0u3ensn7m9p2/jifidadimixebana.pdfIn PDF document text
- https://scalper.ir/data/files/file/83513748111.pdfIn PDF document text
- http://interface-referencement.com/userfiles/file/tekagabotexodol.pdfIn PDF document text
- http://tyextractor.com/d/files/jobemeseruxolono.pdfIn PDF document text
- https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d15c906f3145fdc13f6d5a3295214be7/3035434305.pdfIn PDF document text
- https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83cb9e95b---16848917085.pdfIn PDF document text
- http://coral-travel66.ru/admin/ckfinder/userfiles/files/20235393439.pdfIn PDF document text
- https://hexema.com/FCKeditor/file/6673730153.pdfIn PDF document text
- http://jarosi.hu/files/file/25595928876.pdfIn PDF document text
- https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/564b09a2b16fb08bd367c75d5c0c0097/12689306775.pdfIn PDF document text
- http://ei-windykacja.pl/upload/file/21247450607.pdfIn PDF document text
- https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62372df288---7335436134.pdfIn PDF document text
- https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/41098aa76076f9c63c54a59587d73a28/13603885322.pdfIn PDF document text
- https://gastriklandsbf.se/UserFiles/files/53129139103.pdfIn PDF document text
- https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/479bf83bfbb76385c6b5989112ed1479/sudejapuzef.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_off0000b971.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB971	10604 bytes
SHA-256: `015cd8e156d2ec68b3cd8766e65dc171718c4b90ab90838c3728bb91aef15cdd`
`font_01_sfnt_off0000d15b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD15B	15228 bytes
SHA-256: `feb61c1d45a1e3b1a230ff6b82b95e5ea78a8a4f0fe2970c311d475a28a20df9`
`font_02_sfnt_off0000f7f4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7F4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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