Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac788a00b9c43d6b…

MALICIOUS

PDF

98.8 KB Created: 2021-06-29 15:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 887ac2d3c8fc2a82648c1b2dd52deb80 SHA-1: 67ec8791d4d5ef755bede9fe06e89d5f4cf34e1d SHA-256: ac788a00b9c43d6bf8e6904c766c8b2e144aeee9ba82ae4cf87adcfd31fb9899
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=having+a+guilty+conscience PDF link annotation
    • http://mazdooradda.com/userfiles/file/gurunajutafupigifuma.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06e9c8ab24---galanidirabuxolexarerow.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/295ef189aec44fec18eab894f442f25c/gotamilod.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/93465611408.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/5ea28ce2a7683f31abd98dbc8a9f25ce/banemotu.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1ec705dd9---bikosuxegiruw.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e50bef438---susamowu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caac92f28a---juzijow.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/zuded.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/zepud.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/92786518457.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/49ee0a3ddd78f9bdd27f7acc08d4b9df/51389821675.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/63938766611.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/luwosokoxon.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/e9628173322f214f6592b9ca523e1c89/51521546627.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72b4b00483---jujurow.pdfIn PDF document text
    • http://enerjipiyasalarizirvesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da0dfaad121---68361393216.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74f671dffa---pajibato.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210607_B175DC4AD38BB566.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/givevu.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/6ovi2etcarts0opu95puipfpsg/95070096034.pdfIn PDF document text
    • https://t2sc.me/userfiles/xatuwij.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085c0a6c3c4d---runuxamuxawivajotik.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hbuiikrsn28jcinbqq1n0a9mj3/bugupukopotumo.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/ninanepa.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_off00011fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA9 17116 bytes
SHA-256: c8aaebfb80c3d3e8db611c1cf6b271841ed80d976af2bbd59b4bb0fec60e9066
font_01_sfnt_off00014c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16449 10576 bytes
SHA-256: 839f94c27425749cbe377f9d7ba123dd98d190a35a8603d0378a9d6ea4c7e672

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