Malicious PDF — malware analysis report

Static analysis result for SHA-256 133ae4f6ccc7b251…

MALICIOUS

PDF

79.1 KB Created: 2021-10-20 23:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7ccdacda1552db4803129d78a58914b7 SHA-1: 89919126cdddcb6751853fbd7ca49b5871ca8497 SHA-256: 133ae4f6ccc7b251c540885766f65bef49d2005aefb56a5ced6870c1560d351a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on compromised WordPress installations. The presence of a 'download button' lure further suggests a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and heuristic firings indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc5a22b554---8884570053.pdf In PDF document text
    • http://arcenevents.nl/site/upload/files/66708672222.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/figilupulukulimoxo.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132a18a2b8c2---buxepeno.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/44679403961.pdfIn PDF document text
    • http://klhl.com/userfiles/file/12510290000.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/29cace4a73673bd60c3a9aa9275323a1/79072724297.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/6056142034.pdfIn PDF document text
    • https://bela.geekers.tw/upload/file_folder/file/19741261572.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161336ee0e950e---gunarug.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/41382921133.pdfIn PDF document text
    • https://negaratoto.com/contents/files/49789784343.pdfIn PDF document text
    • https://amgaa.org/temp/files/kukaroxovifokipejusemef.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/baloxegajojavifu.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/0d88d2dfff896e9c66d29d885899f2b1/44145301625.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/71199512656.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153a32d9f094---81342190500.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/wapenuniwebeta.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/fusagaxebafowagajopakoj.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132d116eb8dd---dimotudijonisavusiwimizo.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/90227992815.pdfIn PDF document text
    • http://mlight.cz/archiv/file/wipas.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/RhDyTiV0TgQ/uplcv?utm_term=numerical+methods+for+engineers+7th+edition+solutionsPDF 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_off0000cdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD4 18008 bytes
SHA-256: 87e168fabd8eae92094c077fc0c8b2f056def5562089f35ad9d56212d73825d8
font_01_sfnt_off0000fd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001154e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154E 11052 bytes
SHA-256: 435cbda1c693049423e9d45ba247e7583b95cd0fd6a094451b8b9cb10f14ae98

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