Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f48cd32458ce59a…

MALICIOUS

PDF

71.4 KB Created: 2021-09-05 04:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4b0c010727e89e5f58ab059416a9dc3e SHA-1: be319974584a755f0dd20505bf67fba0a118a080 SHA-256: 8f48cd32458ce59ab517fc40dc7291e1fd3726c6fc733f514a1d3607cdab3788
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=the+journalist%27s+guide+to+media+law+6th+edition+pdf PDF link annotation
    • http://vietthanhstone.com/images/news/file/vibeluxadukogaxokazibajir.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/fagibo.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/wedug.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/likoj.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/8000516335.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/42397235128.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/qpli0oumobbd20k9jl4fl1elpi/rekufawowiginatodupef.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990877ab3f0---refevefipazijone.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/37122126003.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/77663072498.pdfIn PDF document text
    • http://delve-cr.com/uploads/vakizubexudidetar.pdfIn PDF document text
    • http://cy2hand.com/userfiles/nuvibofakavezatenanumowun.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/51613405220.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/32708245379.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/92885460626.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/75755828299.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/65477290687.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/qmru947qqubahrrm8omegm282r/66105603473.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/fenizifoxiximobowutij.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/44166199139.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16085e7a1bed23---wugupew.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/30768446741.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/repowomosavufovevivopoj.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/13c13849e0ab99794df9dab370ca6890/puzowagarumimero.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/84533482989.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.

FilenameKindSourceSize
font_00_sfnt_off0000b364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB364 11424 bytes
SHA-256: cd9322f9ac9092b7bb111b468591fbc61170c49c40136d65abbec81991c5dcfa
font_01_sfnt_off0000ce0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0C 15976 bytes
SHA-256: 07431877d9c285b9a5991c941583c28c4b4b69241ced687fa95f3775b3374aee
font_02_sfnt_off0000f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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