PDF malware analysis — malicious · 7fbc56c6b645e4a1

MALICIOUS

PDF

85.2 KB Created: 2021-06-25 15:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: b454fcd77a360929444993a6c5ceff73 SHA-1: e3a2e0dbe75d07141bcb89b3f5a5dd20bc47cec6 SHA-256: 7fbc56c6b645e4a165b4cb07523e1edafa84df3ebe18fcb48f3ca16d0dbfff95

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF that contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f6234f7a6ca0d3a4abf8db4d199fb30b/98631313630.pdf In PDF document text
- http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e80a0d62ee---zururu.pdfIn PDF document text
- http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac167e24970---95453824588.pdfIn PDF document text
- https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/972608eb1537f022c912caf005b7ede2/japurobubunobajebukasab.pdfIn PDF document text
- http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/adc79dc51303d1ace2bb258d39243d3a/50084093410.pdfIn PDF document text
- http://alphabodysupplements.com/newerac2c/userfiles/file/28253635080.pdfIn PDF document text
- https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/d2526be2f58fca5dd4a6e27c2249a379/jujuwaru.pdfIn PDF document text
- http://capitolmetrophysicaltherapy.com/userfiles/file/jupebetone.pdfIn PDF document text
- https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/46185d2f7070c46ea30b2fbe20b94234/fokatuxedodilagifuvaw.pdfIn PDF document text
- https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/ddg5rcc9d9i55evh8dlp26e1v4/54286557572.pdfIn PDF document text
- http://kamerton.nl/clientfiles/48899374360.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160abf63205c00---digasilububenubezon.pdfIn PDF document text
- https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778d5bb4013---35332809396.pdfIn PDF document text
- http://muzeumostrowiec.pl/obrazy/file/96438262879.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=software+to+convert+pdf+to+docxPDF 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_off0000e2f2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2F2	23224 bytes
SHA-256: `369fe103704b8a3bbc2b0aa9561b1f82b7b06d483bb412a866a1a5f94e1b09c8`
`font_01_sfnt_off000117bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117BC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012fd3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12FD3	10636 bytes
SHA-256: `6380fae2c7154d9a48a213e8296768ff8042aa40a39f50b56a515f18d24d9a0d`

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