Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f3f59220b72e72…

MALICIOUS

PDF

125.0 KB Created: 2021-09-02 13:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 68ed2248e9b134e29d30bdbdb991c4bd SHA-1: 4fb2e3e1da43a561eccd97595481d297908f164e SHA-256: 23f3f59220b72e728295f386f0b42bf3826e52217b7eeae25e86e71d1751fe01
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://subarini.ro/mm/file/dupovolarowibisetabuwujum.pdf In PDF document text
    • http://casier-a-bouteilles.com/file/16018428721.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/dinixotuvutusujowogubikes.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816499a243e---nuraj.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/6ag648chdiahmt1v8s8nlcut57/34179510853.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607252df2783a---79020561377.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/28183310348.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/jifivadubarizusoned.pdfIn PDF document text
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/18468464614.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/384g4imnh9rc6v0o0fu4ku7upf/15883301694.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/43194109942.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/66624400101.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/78004119036.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/d5ba779375b46bebfa14d333658f3022/69278728571.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/46041685478.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/44641861476.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/pojevodirepixuvifopukikav.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d518e2027b6---nipadanofodixib.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/giwugagadutoxo.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160809e74e5926---bukugigawoweparijeken.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/ac65eecfcfbd8ca42f64f34515ad0d5b/sewinazatubojirakunesemek.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/5aacaeddccefba7c63a4f788a830c5f7/5692702866.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0912ca0bde---rovomufuludusotepamabira.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/70742623240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=sql+server+2017+developer%27s+guide+pdf+downloadPDF 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_off00017e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001966e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1966E 11428 bytes
SHA-256: fdcb6b04fdef579fca330cd24c7f59238aa3e4d48928c59cc6d7c4dad151098e
font_02_sfnt_off0001b13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B13B 19428 bytes
SHA-256: da5bb77caf9a348e125726535a3f93f247588d80f2ff2bc9c7ac18cadb975862

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