Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95cbe4c2c4a06be…

MALICIOUS

PDF

88.0 KB Created: 2021-08-17 23:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f7ed7cbaea51dc0aff416f5e5d3c84ac SHA-1: 9781afdb69c0db63893b870f4a7d581dca3b88ad SHA-256: a95cbe4c2c4a06beded3e0db8fbe89dd83e62f245e659bbae0c7c4173bd303c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious purposes. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=examples+of+goals+and+objectives+for+new+employees PDF link annotation
    • http://frutapac.com/ckfinder/userfiles/files/sodegotefidexalifu.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/5575397553.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/10309189494.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/nufkdlpr5vklpn3r81iurpg9dm/96411974908.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/16425594542.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/xaliwujakunusupuzazekutok.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/xujejumisojuvajuxita.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610065be88441---84010660846.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/f01392120f3e2983ea1b5d274a434b82/talizijenozetuzufipufi.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d76d8a536---4664967772.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6e249d0d3---19009172585.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/16729606762.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/712ppm3mv67umjk91q9ibf73qm/balirazuwukofexixuxuxe.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac79462f206---zupuximupik.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/3f6spqicgsqk1lsj746j57rsii/dazosikavezi.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/34334880219.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/22161917863.pdfIn PDF document text
    • http://nfc.soo.jp/file/85068740996.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7c6d72896---99771529749.pdfIn PDF document text
    • https://aspirans.com/files/file/93069475580.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/51445629980.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/dosuxivupusanew.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/womofesaxebotamogijolow.pdfIn PDF document text
    • 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_off0000f1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 11584 bytes
SHA-256: dabe5f251384d5916f503513017e696e07f1903fe5673525831bed9e017bf4a7
font_01_sfnt_off00010cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D9 16504 bytes
SHA-256: c47118142f9120c607e81e9c8a1fc44ba5d10c95254a6cab9619919b4f2df706

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