Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e86013e55feb577…

MALICIOUS

PDF

85.2 KB Created: 2021-07-14 05:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: acd519b54709f8fb2793193e5bfaf0e3 SHA-1: 3b63590bf16bd82ab9c0eb5fff7772f12c5b95b8 SHA-256: 5e86013e55feb577926c139918261fd94f1ff94dc29bbe775f53e45b7b6f91ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/e797946c91cf7cae26385f3800a6aebf/58241623117.pdf In PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/vapuluzibubifaz.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb63608824---vikojataleke.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/0npfop3t6q3np66pjv28jrgasj/kezovanejederuxurifet.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1c921ac08---98475065911.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/dakurotosanug.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9e209b1c8---87225175788.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/o4ev5fstgnklfpihmom2es2g94/15368418479.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/3365945331.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098ae434dad6---joxekaxedodokifepupugoz.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f9b553507---fafijasuzulopogadosose.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/22329647556.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/62372067671.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/k1gevsleo303e9shp0krr2t9dh/6032818974.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-2/20210502095218557042.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/85357675483.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/ruraverajudemake.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ca3435a12---linutabazig.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/c26b40cc48040645ab2db034e2b6496d/96704061373.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/kovadowozumumenonefojogap.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/47704161832.pdfIn PDF document text
    • http://rilta.net/userfiles/files/39443875269.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a19c4004755---zisapufinabodikururaxip.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/23596717639.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/20889387828.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/66779830822.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/99fc8f9edb251e1ec77e471c7d8afcce/76044966900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=dry+lips+after+wisdom+tooth+extractionPDF 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_off0000e8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B0 16964 bytes
SHA-256: 2792567bfa87388d46f88d579e4b3d7b1d699d78c77ac20f8bcd7693639ef0c5
font_01_sfnt_off000114c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C2 11188 bytes
SHA-256: f188bcfab5d2a734998a7209a1031db443231380e4b1f9416d0282b91343731c
font_02_sfnt_off00012edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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