Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ef860d40af8860…

MALICIOUS

PDF

85.6 KB Created: 2021-07-04 15:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78a042b4f76d478ab9ca6b9088882196 SHA-1: af033c6807392fa5e205c805dba266454110fe69 SHA-256: e3ef860d40af886024018ad9d1812012e0226ded403ca4b913ec9e510bb9cf71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=r+amino+acid+one+letter+code
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/hc6nfoh69i9rftgkbmudfpmklk/busodewilarurusosutan.pdf
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/tifufanebudagikakiwolu.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/904b849bfc18995c38e27c4ba2bf5add/11302859441.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/r05jqhnvipoal4n9cn7hqj5mn1/56196057638.pdf
    • https://glycocalyx.nl/userfiles/image/file/polodafevupogesisegorawun.pdf
    • https://marljivo.hr/userfiles/file/lagosometiwelejetogabal.pdf
    • http://scamps.biz/userfiles/file/vamuzinorimikigasamuzoti.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742ac40b491---vojubejagibikiwufagonuxuz.pdf
    • https://tsydesign.com/userfiles/jws/files/mabatuselofubikujowawowi.pdf
    • http://mondoacquapiscine.com/userfiles/files/46003635841.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/986884bc07763b001d16af7ba4516a19/zonawokewotesakewesolene.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/iugubp78uve9uckk2roe9e4015/17455678182.pdf
    • http://ytlcases.com/userfiles/file/bibifisemaz.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160868641285b8---68596467947.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/tamipogatogokuderas.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/e0a9f19edca09eb5199818177029b9d0/14515548095.pdf
    • https://demetraproject.eu/ckfinder/userfiles/files/64159785291.pdf
    • http://boekenwinkelindex.nl/images/uploads/67192289496.pdf
    • http://adaviestransportltd.com/userfiles/file/zejojidefajajerope.pdf
    • https://adepotcustom.com/UploadFiles/file/20210623084506191.pdf
    • https://mimpiindah1.com/contents//files/26596479069.pdf
    • http://d4svancouver.com/clients/c/c8/c8601140a4283eb9b700f388a83987a3/File/62769364983.pdf
    • http://fogathajtohirek.hu/fckfiles/file/juxujudeluxinejovilo.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9b5fa3fc1---30802862389.pdf
    • http://global-insurance-broker.de/downloads/52264054936.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead4.bin
e429deff869f763081b9de279a6e305e8e75c1f7444fe146e7436cce6d14fa72
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD4 17380 bytes
font_01_sfnt_off00011838.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11838 16792 bytes
font_02_sfnt_off0001304f.bin
38c86e1ba749cdd905523294ddba39c6ec19006b8b1bfeeb216931657ee60942
pdf-font-stream PDF embedded font (sfnt) at offset 0x1304F 10408 bytes