Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f11bd6af2a7c892…

MALICIOUS

PDF

85.0 KB Created: 2021-09-09 03:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b5617755f56d8fad07a6b361596a51d7 SHA-1: 3bc37b06502cadbfcdfc14faa8208e92aed1a86d SHA-256: 1f11bd6af2a7c892d3d78fb8d0b54eeb08bd6f2fb77c22c825af7e636c3c28d3
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. The document body is heavily obfuscated and unreadable, but the heuristics indicate it is designed to trick users into calling a phone number. The presence of numerous links to potentially compromised CMS upload storage and disposable hosting suggests a phishing infrastructure. No scripts were extracted, but the PDF structure itself likely facilitates the callback lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 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.
  • 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.
  • 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://thuaphatlaihanoi.net/uploads/files/47550994290.pdf In PDF document text
    • http://zamaro.cz/images/fcke_files/file/88577354340.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210909_070907_8965.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/gejaxiva.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303bec52e3a---35878772295.pdfIn PDF document text
    • http://bamor.org/userfiles/file/fatelujokejamuzafil.pdfIn PDF document text
    • http://teifsepahan.com/files/file/98369403880.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/h2hej8o1vm2j05bj2346bevcfh/40106847334.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/nobemegosafewesef.pdfIn PDF document text
    • http://analhospital.net/file/files/90883291124.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/24c7f0a11ac92bc8d5e4f6a5ad105025/88813397977.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/sixinatamamigitabez.pdfIn PDF document text
    • http://scsychem.com/upload/files/fugonores.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/78395858006.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/nebolexatenu.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/tabenumiku.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/fixoruguxazikuzefisejusa.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/lifibolifalim.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/fosibagevedanizorekok.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/towexawiruxazejam.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/64951778545.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/48937473971.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/doxivu.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/799d2980dc70ce538dd37c9d0ac646a1/ramuvelukodiweteni.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/towanug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=phone+security+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE667 17324 bytes
SHA-256: 548f67c181e7ef935a1b691473a8c535140b8013afb42bd57a67bd79217f9079
font_02_sfnt_off0001003a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003A 17560 bytes
SHA-256: b4374a17cf3964faf89375ac500a20bf5790a61398688682ea55830ee599b33f
font_03_sfnt_off00012dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC4 10732 bytes
SHA-256: 399839d7c17f3111f4b9ff767a8a85221eb626466745c37badef6d2c6ffbd029

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