Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04321279e119727…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 02:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5db6dd75c8433f3237543da7b3bec1c2 SHA-1: 0be21bdeb15394af2c1a836e0d567f646717cb74 SHA-256: d04321279e11972767443af5a5bdcbe4935660e39bb3afd7a44d142330b5671c
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=preterito+indefinido+preterito+perfecto+ejercicios+pdf PDF link annotation
    • http://www.armstrongre.com/files/files/91747459545.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/fujojewagiluge.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a45a953fb6---28626040829.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/27764313816.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/85990194706.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ab5af76e39cb7c9818126295d0b06955/45259956638.pdfIn PDF document text
    • https://kartplast.com/resimler/files/27800669743.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/zesufovenufomibijazituki.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/47630619629.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/tagogodogudotateruso.pdfIn PDF document text
    • http://skisun.it/userfiles/files/82047296922.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/babotewajaravi.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/803cb42f28484aa3fcd5536983eacae0/95823620658.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210526013228.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160902bfc3fed7---20367455895.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/pipudakilenub.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ad81ccb121e---20964231791.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/weragifinotoxiz.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/10501973273.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/tuvovapuki.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/rdtd1tpib5t1o9a87hksso78in/gufot.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/87628804876.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/62355008834.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_off0000d626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 10536 bytes
SHA-256: 4195f8be4bd66077361ec009524b8c7267892838948a73402504fb85882f63bc
font_02_sfnt_off00010647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10647 19180 bytes
SHA-256: f568e2874841634410f08ddf050637f0a1a41a338d46cd6a110e0fbb774a0858

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