Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af6fc577fc19428…

MALICIOUS

PDF

101.6 KB Created: 2021-07-01 21:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4990f630cc4bf21ddf4b02af41584bf2 SHA-1: 156b85e1b9109b0113583a9728c96151f283b3ea SHA-256: 4af6fc577fc194286cf4210d3c01dbe8da644ee5a7ea48ad41a3a7c1e2e23f61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. The embedded URLs are used to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2a78f3dfe---36758174993.pdf
    • http://bensonlandscape.com/editorData/file/71755026890.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072723e6583d---30027407823.pdf
    • https://mszukam.pl/dat//file/27079262319.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7ce7beac6---7665182418.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853fbb4378b---jonedorurepigonodi.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b00c111a966---sonugamojukiki.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608461a22d6f3---tuvaxikodizuvanakexum.pdf
    • https://ktmcollege.org/public_html/userfiles/file/togidokineripe.pdf
    • https://tkquiz.com/userfiles/file/zajenunefefaderede.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa13550a1c8---68699760110.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b54fd6b44252b65fc2efc525071c46fa/37546030129.pdf
    • http://prestopc.it/upload/file/fawaf.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/bo57bv4sqtpq5cdt6tirmqhai8/24948365368.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ed68714f0---9651632539.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16248702432274.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bed8e25fd---kigut.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726a7baa051---kesexepewonaturedos.pdf
    • http://sam-global.info/files/file/gowuforobuzaforuxenifofa.pdf
    • http://blissworldbeauty.com/newerac2c/userfiles/file/4142215967.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceebd7bf58---witopulikos.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/534cd15486230e716ee4082492a67d5f/palonulerelorer.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac5723039---zelije.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99184d598---76000311554.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=examples+of+simple+harmonic+motion+in+daily+life
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124e4.bin
f25e03fb99b232a7a5bc8e368fe19b8b1caa3318f9384a8224fb804838ace360
pdf-font-stream PDF embedded font (sfnt) at offset 0x124E4 11084 bytes
font_01_sfnt_off00013e8d.bin
fc547d013d8ad4501903bd2d31959f6f6e24f1502353cfd2d87433ab4988497d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8D 18840 bytes
font_02_sfnt_off000170e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x170E8 16792 bytes