Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52efce2c7c8a62f…

MALICIOUS

PDF

84.0 KB Created: 2021-08-25 13:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0de335940229c80c07cf0c004fc05e85 SHA-1: 018d6756a7c4db242aba13f1e84f50a53af047da SHA-256: b52efce2c7c8a62f13a45a45dac7eac40e7b8b8c3ca4e94aeed602c4f74ef7b9
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to various domains, some of which appear to be compromised WordPress sites. While no scripts were extracted, the presence of numerous links suggests an intent to redirect the user to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/5286906095.pdf In PDF document text
    • http://aquatherm-graz.at/files/97241661571.pdfIn PDF document text
    • http://cochemical.com/upload/files/64385284275.pdfIn PDF document text
    • http://qzgj.cn/upload/file/jozinomitedufove.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/bobuxazewivodisarerujejex.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/kpbt06lsvaferml8rl1cjo4c4o/nuzikiwolaborevonudava.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c78da0ef8f2759b13a734f3b19ee14c/3667408740.pdfIn PDF document text
    • http://bakerfamreunion.com/clients/1/13/13be4b03bdabdd3a133c3ee64ed6201b/File/52782540721.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f504f3e4ff---85254155495.pdfIn PDF document text
    • https://chptravel.ir/data/file/76624308700.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093fc069cbe5---vokegipegezipodebejutus.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2a3a8b7703e72fb3d9223ae0fec54287/40855305289.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/qbdd9nvut52f1u993pd8dg6rq8/kovozesi.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/db23fb3a035d1dcf1b8defff02933f56/bivoni.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/pidawutimatada.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/rugowibowav.pdfIn PDF document text
    • http://maihome.hu/admin1/file/lulabivakiterisiju.pdfIn PDF document text
    • http://stavbyhes.cz/ckfinder/userfiles/files/48232405873.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/39327990325.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/62637264732.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a50478c5868---74214595768.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/48531205522.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/fogekuxilobax.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210801_E6D5D498C6A6207A.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/20700985182.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/qavn4bhmomr837nscfvedrlk3g/nuwoxafitigukibifozuzowir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=our+national+heritagePDF 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_off0000e61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2E 16912 bytes
SHA-256: bd2d4717808427864324b93d8aa0ea6b2dd07ba4764e825e93f7a9048c1793e1
font_02_sfnt_off00012a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A59 10344 bytes
SHA-256: 869fae17d2511e1fb2f117eaad072f3a58dd20d1e0f8e3cef1b7fd3b5a8b6219

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