Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3369c14d285a488…

MALICIOUS

PDF

89.3 KB Created: 2021-07-16 19:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f8fda8d7be7cc2b9c0677a125ce517f5 SHA-1: 124bba4732808ea72691ad0e823b94fc271bcbf9 SHA-256: b3369c14d285a488f3e59b0486c6788b61d202f026cc75658e54a74db0c11a39
184 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • 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 http://thedewakohchang.com/image/upload/File/uxikogulokuzoritu.pdf In PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5bc1b0e10---lerawumaxuniso.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/71javut363veq3fqo58aqgcl1e/nosokokexanukuteguxekale.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/zifis.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/a84fb605e28f976be908ad2a0a6016c8/wuwevibedi.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/af8f20b734e3d7c2afcfc66f78a563b6/goniga.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad988c0aef---82892039715.pdfIn PDF document text
    • https://rockoncharters.net/home/rock/public_html/ckfinder/userfiles/files/vusejanosuvuzi.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/kuzibevetakedifem.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/27474778573.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/f6b0c4a94105fa1a1f3ec26957c6bffa/pixej.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/wukagemipejadapupa.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/55602810473.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/senojawuxejezosor.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/2agv2e294jpsc2sih267l29kgo/74221558281.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/2380507968.pdfIn PDF document text
    • https://storycycle.com/ckfinder/userfiles/files/jugononoba.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/kejuzuzomoj.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2105300748424742997l2gfg.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b393d9a4b---30580012937.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160872173cad78---34424879772.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f6f7c50decef2adb2e1f4861b0dca24a/27951739132.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/bf25572c62dc51cd59c51cba45aec5dd/6050365587.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/r917f6dbk8424q0fpnkju8r6oe/55891171117.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/750adfa004bc6c34faed2cad72aba1a3/91082313730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=nium+pty+limitedPDF 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_off0000f8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E9 18352 bytes
SHA-256: ceb972af38f23a88ed303dca210d84674b0c24f221113137527131fa9794fb84
font_01_sfnt_off00012975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001418c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1418C 10092 bytes
SHA-256: 9ba93bf2b78af5f408791c6c984c3c4c1c986e35270d8041a9104e3a6052d1d9

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