Malicious PDF — malware analysis report

Static analysis result for SHA-256 689028e14f1a50b6…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 05:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b7748e790e00ba80bb7db8f86ecb3495 SHA-1: bbeca62e536d98292fb55a86dcdfa7795cb9411e SHA-256: 689028e14f1a50b66f1a1e91bb03ccd1879a27d665d53bb141d5e0184aacdbd0
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9975

Heuristics 7

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=west+bengal+map+pdf+file+download PDF link annotation
    • https://dcoderesearch.com/uploads/70597915683.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5ee55b8f8---mudugijab.pdfIn PDF document text
    • https://alutat.com/data/file/25641090225.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/16582732389.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1624041040.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/t59lmd7or265ibnh8ljah8os05/migiwizometebuv.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/17843172979.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/37104973470.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/nuvupilopivumodivubotug.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f80cf95c00---33687484647.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/0hm4u9h61rqq7bls6m12pi0rs0/39002492144.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160710128c88ce---50739745156.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/gokorakevixez.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ogd327th37nji3t2pj29uolfap/sujivizoboladusina.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/totexubo.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48f9762056---zufolumutaliwar.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/ded766b77d5a131c9ede5a149bd6679e/fupek.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/wejadakemeje.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/9053229923.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/51722624456.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/65114365352.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/mebevifevij.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/45680275016.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/kozoragipimowasex.pdfIn PDF document text
    • http://sfera-vlad.ru/img/file/guxagapagemasajowu.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_off0000d625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 10960 bytes
SHA-256: 3b1f5645a5647d1f20bee6b9b31905d405c961e891c7f96676a965895a04362f
font_02_sfnt_off0001074b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074B 17600 bytes
SHA-256: 5264124265fbc68d1cb7d543ac3b3d9280e19b025d859b76b70a5a1cbf43e222

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