Malicious PDF — malware analysis report

Static analysis result for SHA-256 721e17a2dbe43ce9…

MALICIOUS

PDF

74.9 KB Created: 2021-09-02 07:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8e34c027b321045475b3dbcfafeb9ae4 SHA-1: 6f9fbef082edb0474de10fd6112ae7a444d3900a SHA-256: 721e17a2dbe43ce954445a4ede1dfa489086945a9364d1356e73f6b07d3ea405
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These factors, combined with ClamAV detection and ML classification, strongly indicate a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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 https://motelandratecuci.ro/userfiles/file/wasuniwukukelobe.pdf In PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/25024226328.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711f7e2988a---tekutagave.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/vosaxofijedelemutiwur.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/18576325785.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d55d2124b---bejofupazisawezidefexali.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/48692667749.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/notivivokesaxik.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5575cb41a---12932910953.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/xonuxovulabonogosa.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611d11aae8d97---47078844335.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/9e5280a1477fb8fe3b2748237e76d84e/burafakobezibalatux.pdfIn PDF document text
    • http://allasclub.com/campannas/file/16315090129.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/mupasorusetije.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210806184341369949uh22no.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761d30e7ca6---wisumaxudijeb.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/pifowodalanonivo.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/58779880913.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/77091713682.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/5588562784.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/38e50bd5f5de9755aec0ba4348cd4e54/vusisuwad.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/13279973714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=at+least+once+rule+calculatorPDF 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_off0000c47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47F 10212 bytes
SHA-256: 55e1ec8ff9430ea42336c473a96849874e5a1eac19e7edb3393a815fc7ebc01e
font_01_sfnt_off0000db9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 16604 bytes
SHA-256: 12bfccfa2d8ac50a99f89410d45cf0807cde333a0e1e4b86a0319aced1f58161

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