Malicious PDF — malware analysis report

Static analysis result for SHA-256 83db9bead585cd0d…

MALICIOUS

PDF

107.2 KB Created: 2021-09-06 17:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee08d07db839017c272a77f9bae8a53d SHA-1: c13c8014d12871646608da985100429dd4a501d1 SHA-256: 83db9bead585cd0ddbf531661b227e9d18d43e39dfb64f41537575d6c32eb1fd
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing a link farm hosted on compromised WordPress sites, designed to trick users into downloading further malicious content. ML classifiers and ClamAV also flagged this PDF as malicious. The presence of multiple unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 9

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ce65e46c1---tunuwurosiket.pdf In PDF document text
    • http://suvenirzp.com/uploads/files/fofosiwudebur.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/82408307562.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6c8eecf51---jidegabixulolo.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/luxide.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd8cc4c0ae---wodijubazudogavuv.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/zolagiwanem.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202108170214451436.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/13fbc9b08d32ebe3855cff84a6145e0c/44201565768.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/0caa81347efef64327c6ddcdbae44966/deregeke.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/bpfjo80oo02ijm6n4i3v7ca6on/sisimatikeme.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210806100939.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/20602363608.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/fepudivuzi.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/nezoge.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/qvv7kst1a800vr52cijahed8ij/rarageziwat.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/kajazakemotekumikoj.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/bonugom.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/worivepagusevovilo.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/99126633723.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//68355622375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=new+holland+276+baler+manualPDF 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_off000139f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F8 20204 bytes
SHA-256: d87b34d2236e34603bae71b64cba78ffb85a82ca37519dece9e5b8dde16cfe01
font_01_sfnt_off00016ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EE4 10796 bytes
SHA-256: 5a458741bf77152cc06c0f33903f85bf5a0b2cbfa9352074ebc56c6f3eb2a50e
font_02_sfnt_off000187b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1