Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7e4dbab19f3721…

MALICIOUS

PDF

88.8 KB Created: 2021-09-02 01:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8e134ac0d6ebc3e3724e977f05e2a41 SHA-1: 34e8b02d258cec130fa0264506798d0d22232460 SHA-256: ab7e4dbab19f372169b68f33fbc75ae613d11599556629be6297c6db4bc32b54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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, hosting numerous links on compromised WordPress sites, likely to facilitate phishing or malware distribution. The presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d317a94863---2563453878.pdf In PDF document text
    • http://abwrva.com/uploads/files/85994417595.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/wafore.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/gofolotojikujidivu.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/33708861684.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/78419c78352ba6ee5b573ce2b1c901ff/41241114446.pdfIn PDF document text
    • http://df-2.de/images/daten/file/nekuvunoborasulorona.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714dfeb1ad7---35687069077.pdfIn PDF document text
    • http://peeweeslearningcenter.org/clients/5/54/545fcf94abc6bccf175f3035c740e6d3/File/visexokafupaserebenagezix.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/4396804905.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160927fce32dd6---64672122616.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/84322018104.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/21244818717.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/55316109675.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/jarisegusogewirixo.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/e7d229a84fabc94070536c0d435abc86/zulefinowivanowodo.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/92697496102.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/6m50sjiq20as1avtdd2jelsms0/219818881.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/nugobigakigom.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/c957c0501e0765080c8c6b6829db8a9d/jimeletekate.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/f4f3b010744d4adf4ee5888f469bc552/goselatezisem.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/18436578277.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/60740838689.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088dd0eaabbd---fuserulema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=whig+party+supportersPDF 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_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 17556 bytes
SHA-256: c56ab50bae708f05e09ab0931e207a0f9df8cbf1a36913291ce9d170f56c6303
font_02_sfnt_off00013cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFC 10588 bytes
SHA-256: e7de45ad5b6c50efad2fe90d1182f0bf5f8ed8eb52c6a5de1eaeee11e9bd569c

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