PDF malware analysis — malicious · 4121b7084d4589cd

MALICIOUS

PDF

82.1 KB Created: 2021-09-08 17:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: b0135ef92576db6179a33b1d20139044 SHA-1: 08dc4c0097a767afdc8f1be94033a919b43dad65 SHA-256: 4121b7084d4589cda294fd6fb9a9e8399148f7cfea1fbf5692fcffb20a09a4c6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malware or phish users. The heuristic firings, particularly 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION', strongly indicate malicious intent. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=pdf+editor+gnu PDF link annotation
- https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613682e5e657b---gapafowuzerusigoxu.pdfIn PDF document text
- https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/gokojarabufozanatalifos.pdfIn PDF document text
- https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e6ff5fd20---busafujov.pdfIn PDF document text
- http://vanxuantravel.com/upload/files/8228639636.pdfIn PDF document text
- https://hr-serdahel.hu/images/file/89974611175.pdfIn PDF document text
- http://hotechike.com/files/files/pusuliwesefutobusuremuj.pdfIn PDF document text
- http://amkchem.com/upload/files/gasesizironenodufulajoxik.pdfIn PDF document text
- http://mawaevents.com/uploads/file/59927712192.pdfIn PDF document text
- https://dhesient.com/media/65164932045.pdfIn PDF document text
- https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/fuwidijebobemurawowa.pdfIn PDF document text
- http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/6edb90e8aed324eb3d7392210809f745/kaserupasotog.pdfIn PDF document text
- http://canigrup.com/userfiles/file/peburodozitifeti.pdfIn PDF document text
- http://creativetechno.in/userfiles/file/legasibixifozuneseni.pdfIn PDF document text
- http://mxag.com/upload/browse/file/zawut.pdfIn PDF document text
- https://duext.com/wp-content/plugins/super-forms/uploads/php/files/485121f19beb72c95afe696a2c7ae7b4/42921006791.pdfIn PDF document text
- https://r4binsh4h9-att.com/contents/files/45838327045.pdfIn PDF document text
- http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613306007b88d---vofatudisu.pdfIn PDF document text
- http://fcraregistration.com/UploadedData/file/12840451518.pdfIn PDF document text
- http://amghanoi.com/images/ckeditor/files/dopiwase.pdfIn PDF document text
- https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/285988818cf931169376ac2c21625144/33997895335.pdfIn PDF document text
- http://car-zone.sk/data/data/file/83935771401.pdfIn PDF document text
- http://tzsunup.com/upload/mudirixapixinumuvev.pdfIn PDF document text
- https://grdr.org/paidel/ckfinder/userfiles/files/16979594585.pdfIn PDF document text
- http://xn--j1aii.su/userfiles/file/bomikugekupavu.pdfIn PDF document text
- http://erodiertechnik-wenzel.de/userfiles/file/mutosobosurul.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_off0000de54.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE54	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f666.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF666	17320 bytes
SHA-256: `77c61b570a5588c7d4171b7999f051f42d17d041e31095101aacd51748d5ed96`
`font_02_sfnt_off0001238c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1238C	10252 bytes
SHA-256: `f4c1fe22352e0aa5ed1f100899922d975cdfb378ec15d442384770740bdd604b`

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