Malicious PDF — malware analysis report

Static analysis result for SHA-256 56764d33cf792db7…

MALICIOUS

PDF

85.6 KB Created: 2021-06-29 19:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fbbb0f322e2d92d77a26fe11160e0669 SHA-1: 71667f1a7dcd2b506836681a5f7d9b215993d431 SHA-256: 56764d33cf792db7682dc5bf8873f73dbdf8edf66dc22926732600346f01d830
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. The PDF structure and link farm nature are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/08983qtrbr91cmhdfktbvma7j3/32865341762.pdf In PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160758252428ea---48137849179.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a931e26d2f5---zenunebedutab.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/diwub.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/0a73d302ec90b9c8abb8826b59da2256/ragapemeribobuxosana.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b784752acb---21982462124.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/lavatad.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/31b09d7774d07f80ca6e2a5de6e3c59a/ronaxiti.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210629000839.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/wabagizaxulaf.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/23044258115.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070548a6caa4---gojupixakajenipogon.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab3f18efd4---4938874256.pdfIn PDF document text
    • http://arablift.net/userfiles/file/zuwidutajuv.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/6482ec753d390c6782c61a3aa09565e4/61637934392.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881bd333290---85441220672.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0acf4b8d6---26874793139.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16094a12745ace---59003012311.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/io9n0k31h3lmtjps4l8408mmk7/5342313751.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b888c579095---51778252848.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/ed023dfdcccd6c554d3780bb13a5c154/57353611765.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607117f47a74e---pezebekapexi.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5c82c5ac8---82512283570.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3ecd6cda6---92957677414.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070d0f4c6435---kupexikazabovilalifeke.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/20765885592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=tablets+to+reduce+feverPDF 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_off0000ebee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEE 10544 bytes
SHA-256: 0bbaab242b1267107c7f9dcc320c7b22b9a73f73023d5ecd66a8ee5ac6236902
font_01_sfnt_off00010436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 16680 bytes
SHA-256: 448b6c13016b1eb17729c12ecbaf9aa2a367d17a785ddf60f4c3fdd3f37b63ca
font_02_sfnt_off00012fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1