Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee8f1d88ed32979…

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 14:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f8067fd1ab32d3560c586934041cd4a8 SHA-1: 448f2a593ad7dfdea56a24a265943cbffc152967 SHA-256: aee8f1d88ed32979ff524ec9b8b94d61998c979de823af2320a6d82f2702c5d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are likely part of a link farm designed to manipulate search engine rankings or redirect users to malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, suggesting it is a phishing or trojan delivery mechanism.

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://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb969bd646---nujesuwut.pdf In PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cefc147cf---karulogukewibu.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/0fd2036b97643f872f506ccbaaa11043/mowiririzimedozokoz.pdfIn PDF document text
    • https://sanagustin.cl/files/faropixusefebuli.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6b9e349171ebfe68a2c3d26ac66bfd21/tipazotoxusisewupinat.pdfIn PDF document text
    • http://perksys.com/userfiles/file/286085677.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/3evki93tqv6llgmp1on9sqiig8/85429118786.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/giwazigezixavelov.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/531946b1095796df7e9b88d089fe3734/lokobozal.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/dixigejoso.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/lolabopexuw.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160795ae68cb0d---34575552865.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/bdaca2c1ae058c4e07807cf355f9dab7/tapidovagapemakofamoju.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac94330efcd---4012734004.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/sajibelurosudok.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cad1b96e2---65507233055.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/talixebadofelezud.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/zabuxevepa.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/30804288268.pdfIn PDF document text
    • http://artepcb.com/upload/files/sawetet.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/92578ca8ef68582fde18c2e9cfb62844/5740643890.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/d16a9f4e6f75e50a799367cc52a3219b/jupuxutojulojutirowebuwof.pdfIn PDF document text
    • http://socialsipahi.in/assets/ckfinder/core/connector/php/uploads/files/81036700465.pdfIn PDF document text
    • http://bougerpourstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/5309835622.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/64729890780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=list+of+companies+in+kenya+and+their+email+addresses+pdfPDF 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.

FilenameKindSourceSize
font_00_sfnt_off0000e667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE667 16724 bytes
SHA-256: 7939e29d929fce77ccc511bb79344cea87c1b74d34ed3415ee4a78214fdf83df
font_01_sfnt_off000111b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CA 11048 bytes
SHA-256: fd2ea40b605df3b51e428f3c4673fb42b54d0698f4d494f3b2af30c663a8389b