Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9af2241111c338a…

MALICIOUS

PDF

90.4 KB Created: 2021-09-03 17:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e13dd4f2aa9f630f560d410d07ba29fd SHA-1: 29b62859324aeb4aef0e3070a7771b844229c878 SHA-256: e9af2241111c338a9a8a883d9005ed97f134802a252fb7acb044a6c504f4f042
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution attempt. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://clairvoyantinfotech.com/demo/images/kibelilowanikavizebogami.pdf In PDF document text
    • https://clubslotalmatriche.com/calcas/file/1742267231.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/37470167243.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/kojubarujeletidovukudu.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/64625827555.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9f282b68e---noripatejizikoro.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/zesowejabavos.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/a509ad1716ec11f64912be42a3e2d81d/fipobemanuwawirabolenalos.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/50243630900.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e96825bcf---58579712657.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/22849788036.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/zusijefegilajasujixariku.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/9a5db0f258055815c7d81527b408f7b3/sojibewaxotogizodidu.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aba718b0a68---19377209842.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/88684766664.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/57437847907.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc07e754f6---ditolijakuzitezejemozabu.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/babiraboruxuwilur.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecdb77553e---xipafokuzozo.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/tst2ql3vcj08postuo24bi41cu/93808292641.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/1f295196149cefb214c8a84da41385a1/sijogunakujov.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/61923295135.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/kizinigipaziz.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160fe65ea3cbbd---92436477505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=bolognia+textbook+of+dermatology+pdfPDF 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_off0000f9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F8 18400 bytes
SHA-256: 32e6f113ee948d022760d8b6e116313fe3a2da08a3ff931eeb8a90bbefac9ee7
font_02_sfnt_off000141cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CC 11176 bytes
SHA-256: 0fbe8a97db90a00c1c8e8594f22b2b0969acf142b7d990dcc03f1e431a6504b4