Malicious PDF — malware analysis report

Static analysis result for SHA-256 7210adc36e39f603…

MALICIOUS

PDF

86.8 KB Created: 2021-08-26 07:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f63a8858daae4c4b2a20ab735f0c8986 SHA-1: a91f9a4a39bacff0b22dcaa0c2925575075cb56d SHA-256: 7210adc36e39f603ad90533fc10ec7ae7d3cd95cbc33204ee5a057df7d86a042
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The presence of these links suggests an attempt to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/623a1eec0364ca5acd8ca77c0b68da7f/kubijewuvamonagowafa.pdf In PDF document text
    • http://adveotec.com/img/file/xifiton.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/7101855337.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/gogabe.pdfIn PDF document text
    • https://msiutilities.net/documents/38940201311.pdfIn PDF document text
    • http://esistore.de/userfiles/file/2039116431.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d10bdcb7f---51982460011.pdfIn PDF document text
    • http://yuha.be/_files/file/84039825161.pdfIn PDF document text
    • http://nfc.soo.jp/file/2476563326.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/74375154752.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/begomofinup.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/44236737768.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071f32c2d192---votofiwuzodikejoponawo.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/gedipir.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/24853136981.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/b8e13c6c3663f5b90544900ff6612b52/65309617151.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/183c4072cbc9df95b3bef08606ae8e06/97165526187.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/pnab3psfnnt68o6lkp2tk7pai9/94371166480.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/59079835021.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/67708110996.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/46809083547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sinus+congestion+and+dizzinessPDF 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_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001060f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060F 17320 bytes
SHA-256: 99ed6c2c728349dcfa7721510878c46a684115a29f56538c4b1df0df38d3666e
font_02_sfnt_off0001329e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329E 10632 bytes
SHA-256: 5562b9f8cc8744b563e65186de89fd0f3fda76502886bde36861e48be06e4e47