Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0a2b5c38ce038e…

MALICIOUS

PDF

97.1 KB Created: 2021-07-06 14:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8ddcf6b8baa5629bc7e50ee466f4cea5 SHA-1: a428b40a4ee39807e65b51050b8aad1e49b4d857 SHA-256: 4a0a2b5c38ce038ec78501b8db5388ee579da3098ae8e44be56e5f0e3bcf1cb6
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to download further malicious content or engage in phishing. The presence of multiple distinct hosts and disposable hosting suggests an effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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 http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/mujedivez.pdf In PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a32d5790992---21243516942.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160d42658c1230---dukasikifej.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/u4e0i68p21ahidmqra15o4s361/683747269.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/wotojamakezadapuz.pdfIn PDF document text
    • http://saptpadi.com/files/file/95896376126.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/771a5e2a4bc42c6a6729b47216294ea5/38376560630.pdfIn PDF document text
    • http://rld-carbon.ru/file/vadefurifasudanofoxo.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac0a102434---71347744211.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/vegekoxekiduxu.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/b4lngedg802sbntlkksl349dq6/31943306592.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeba3509683---bebozetikodirefavomo.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ea0d22297---10157243064.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/budopilofutaladovubos.pdfIn PDF document text
    • https://activepymes.com/pub/file/mosujedelogeken.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/d09c4df9ed763f9b67e7648bfa671d90/61951221314.pdfIn PDF document text
    • https://buka.ru/sadm_files/nemizazedeba.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/98cde99fd37b7c9720a5b218b737c922/nojitavakawejomoveteribe.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/1920497191.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cbc0749b7---zakusekilulutaloposiwujed.pdfIn PDF document text
    • https://cecprint.com/images/file/godevimolivi.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/90229290624.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/78347779053.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/85669496778.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cda8e2f1a58---85523371373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=spider+man+homecoming+1080pPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B9 18976 bytes
SHA-256: 1a5fe8fa654ace98ede544d332a6a65592f634c3e26233548784ad73c8ae14bb
font_01_sfnt_off00012bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143BC 16732 bytes
SHA-256: 8d839163a044c5a229aa92abbb3030be13840ad39a79f32dd9c29cff439fd2db
font_03_sfnt_off00015b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B7F 11108 bytes
SHA-256: bb052dd14e4c191b4a51268ca50aa1e39737d7556e55ebc72a58a33bb022a714

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