Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed3ddeab93bef00…

MALICIOUS

PDF

91.3 KB Created: 2021-09-04 02:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f7156ee5de2fc95a35322a40a1bb89b4 SHA-1: eade331690698257d9d36470aa2e72eef00a8f8c SHA-256: 1ed3ddeab93bef001b9f11504bf36600c5cf96693b8b8f7ead442d374b41bc30
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier as malicious. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number in a deceptive context. While no scripts were extracted, the presence of numerous embedded URLs, many hosted on compromised CMS uploads, suggests an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/2c0aa1abe8055e26f686f83672ba524d/8753908103.pdf In PDF document text
    • https://cantarefides.ro/admin/userfiles/file/reses.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/8691025eb05c8cffbfd87f5a3a090356/30108159379.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/tn6gk5j7ngn6v522asakeps6c7/masusavarexiwezarefosewe.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/16657131626.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac31824676---87762856149.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/31498467763.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/vofuxonapupuwun.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/tojazowo.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/60214718915.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/fexojalaxevaroxav.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210824154607.pdfIn PDF document text
    • https://tavio.ru/files/file/16680004214.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/9721163c4cc577e1831590ade912457a/103044681.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/93157242307.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/80713460482.pdfIn PDF document text
    • https://allianztc.ro/files/file/60489539296.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/ziwazekozagupuvasikisu.pdfIn PDF document text
    • http://torgoborud.org/images/file/lijikodigokutuxetukimo.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/pevufetoliju.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49afae055b---54294034419.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/xipuxowu.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/3297262959.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/47lslltspldoguodinio5osa0v/38256380568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pharmacovigilance+pdf+bookPDF 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_off0000fe79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001168b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168B 18524 bytes
SHA-256: f1fea1cfe3522f0dbcb871914aaccd5efee5ef75509a2493b8019f53261d61dd
font_02_sfnt_off000145ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145EE 11100 bytes
SHA-256: 094929e5d4756bd07df7a0edc4541896ffbafb15428d00b467306b5e48d03fa1

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