PDF malware analysis — malicious · 3f13281c820290a8

MALICIOUS

PDF

78.9 KB Created: 2021-05-10 00:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11

MD5: 89b155540c9f4760a624d2dc6278d2bf SHA-1: f0452cac9480a9175545c08df2891747016d5cf6 SHA-256: 3f13281c820290a8d54db45957367909c916101a70f29f17335e1e0d758f990f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the overall structure point towards a spearphishing attachment attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://crewmak.ru/uplcv?utm_term=logic+brain+teasers+with+answers+tagalog PDF link annotation
- https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d157c2d668---99066634070.pdfIn PDF document text
- https://palcev.ru/userfiles/file/tajino.pdfIn PDF document text
- https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/026317ca5a2be30433c3f939900fe4cf/xewevefin.pdfIn PDF document text
- https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754f024dac8---84093997951.pdfIn PDF document text
- http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160802e64c33dd---razogekikekewenun.pdfIn PDF document text
- http://beiks.info/public/file/3488504896.pdfIn PDF document text
- https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/a34a483791ed54b7c90e3794da300634/72570592931.pdfIn PDF document text
- http://iphysiology.ru/upload/10767155898.pdfIn PDF document text
- http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a642f67615---73763608263.pdfIn PDF document text
- https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/mj5q9fqsl6b2tup8702j6lke0m/befuzos.pdfIn PDF document text
- https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/e344391d9006fd115eebb6998cee5592/guvavijeduxexomawabutul.pdfIn PDF document text
- https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e4178479f---79545704200.pdfIn PDF document text
- https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/3514d5861838f5ba90ba957dd14aa5ac/21805540934.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ec01.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC01	5020 bytes
SHA-256: `881622efbfb8f4a61f556a122945468a08d1aa0d7dc3f0887fe70b169fd3513d`
`font_01_sfnt_off0000fd1b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD1B	10428 bytes
SHA-256: `31b1ceb2d00b37b778c70b78f1a5bfaffd5aca1b389f2accf4a3be58227e0f80`
`font_02_sfnt_off000120cf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x120CF	4324 bytes
SHA-256: `ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3`

Open this report in the interactive analyzer, or submit your own file for analysis.