Malicious PDF — malware analysis report

Static analysis result for SHA-256 6153f48a731b55c1…

MALICIOUS

PDF

63.7 KB Created: 2021-06-24 13:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a575fa92df4afaead192c5191fa1f887 SHA-1: 5665b530e019a06ce72b3955da7ae6cc0adc8d49 SHA-256: 6153f48a731b55c1c0053e3c9062760e30e1f77e327f05468cad9b9b5f3f7849
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF document contains numerous links, many pointing to compromised CMS uploads, and is flagged by ML classifiers and ClamAV as malicious. The document body, though obfuscated, suggests a lure for 'Microsoft Visio 2019 free download with product key', indicating a phishing or malware distribution attempt. The presence of security bypass instructions further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/2olif7fvtf5f6ar2ekh1hk6ulf/dugejosi.pdf In PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2b7d8c82b624ec806b03f1b325705edc/41803776193.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/79290fed53630e85958beaf1b1bcc133/vikix.pdfIn PDF document text
    • http://mwflower.com/upimagesfile/%5C/vemezisexosudavenuf.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cca9d2488---29257602482.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/14448341594.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tghpcci7h7amik6c3vi5aq1o29/bedimusojoralubufamokiso.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aed165da8c---gataka.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/lokalafiwemimoxo.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/9d6b6e1c0071c89210c14cd5d21ae37c/64816737822.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ftq95gbebl3tjua1mq3uidv7v3/29266070356.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/lizev.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/080376ff51d2d0969ac9a2545517ec8f/44598399569.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8541a88233---48134076363.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/gilolafodevuxupaluru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=microsoft+visio+2019+free+download+with+product+keyPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA4 6048 bytes
SHA-256: b1e8f908a754f72da7944fdeb6c83c42a3261a6bf5b251d0c981b0f0574e9a79
font_01_sfnt_off0000d45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45E 10768 bytes
SHA-256: 8a499c2756a0f528d0f777e84b3f66a4a176c6e06288632d1da821132562a1ba