Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35496dd2db9ddb7…

MALICIOUS

PDF

86.1 KB Created: 2021-10-05 19:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4dd91d6c3869637b7233b14148bc2f3a SHA-1: efe446011a78c0938e06e9aa8a5c9e79457ad062 SHA-256: b35496dd2db9ddb74713a51aec2e49bbefde8c383ec89e23ff8d7e8f30b8899a
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many hosted on compromised or disposable domains, suggests a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document likely attempts to trick users into calling a fraudulent number, consistent with phishing or tech-support scams. Although no scripts were explicitly extracted, the PDF structure and URL patterns strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=wow+classic+regrowth+spec PDF link annotation
    • http://thementalhealthadvocates.org/files/userfiles/file/zuzagegapoxuzapupijowe.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/vimemubekebufuwomadugomi.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/jupolumivuwemukore.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/fuvibamo.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021918_18330_766.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/57080232670.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109172005123385.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/2258001399.pdfIn PDF document text
    • http://mrybalko.ru/files/77293118666.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/zekez.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/gevevinokilijupujarur.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/13988200102.pdfIn PDF document text
    • https://binhvi.com/upload/files/48051983155.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/dowojamerafuvodiruk.pdfIn PDF document text
    • https://onecre.com/images/content/files/40241100983.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614021d148ced---maponijadegivaju.pdfIn PDF document text
    • http://www.tecnobor.es/ckfinder/userfiles/files/58419053593.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/j2gqmualpb6ls3qs5lgbjq32m3/zikudasibatagex.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/pisenutavame.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20211003072532.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/39595592489.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/41480380516.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/61715306735.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c67a4e0bbb---66026863106.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_off0000e948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001015a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015A 18724 bytes
SHA-256: 5f08c41b2f9ababa6740569c2e6a800704b61b46b16119d58e06c90c75130814
font_02_sfnt_off0001323f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323F 10628 bytes
SHA-256: 565dccb51e2f761c04ba8c4601d84a478675894c044347803184186fc58d6ed4

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