Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a2aacf2a8ceda79…

MALICIOUS

PDF

104.3 KB Created: 2021-08-10 15:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5279785b788868f9465d12ef864df177 SHA-1: bfa16394c3961422fa3ec11c18b4bff66bba1b62 SHA-256: 3a2aacf2a8ceda793711e758baf03233a0fbd1b0f95165bcf404682f50726989
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The embedded URLs and link farm structure are indicative of an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/55746ba47391ac5de6a42a50e77ebef8/wakozulefajowujoj.pdf In PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5b0e6e98e1b5f6a89354eb38ff89047f/77861144693.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/88319833736.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/lirokorepejig.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/0f8748d146403017157295d336227aca/37956455516.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/49892653548.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/kenejodox.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/41995365987.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/jusubiruwolojuliwamux.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/67798614239.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/0d4927e768ee7575a6bfad20aba7b631/74788466916.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083509c3390b---79343024060.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/rireguvonivara.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/nuwipos.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/sexumakuvurulasowalova.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/toroverujazosijezo.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/navenixekozadarikit.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/75109663b0134f1f31df5c205829f792/56925190172.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/54039418934.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/dcf25dd48f74db3ab548744d330d3d26/85764269535.pdfIn PDF document text
    • http://lagrupacio.cat/file/puzomufazodido.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/de045de47288c6abe0949f6a0df00eed/wuzubuvepibabenoveletis.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/acbc98dd25ac0c784f947d5596814bd2/wifimirukuju.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5f269e3e1---dunotalup.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/wewotilobofuwadedajuruk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mcdonald%27s+menu+prices+2000PDF 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_off0001319b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319B 17996 bytes
SHA-256: 79c48198e2040c36d93f238f8372884049ca2909955b8c2e706d7c1dbccfe093
font_01_sfnt_off000160e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160E3 10944 bytes
SHA-256: 327afa07a554b18230785d31205e8b4439616d6dade217a6ac608a3f5742777d
font_02_sfnt_off00017a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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