Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38219251be1afbb…

MALICIOUS

PDF

133.5 KB Created: 2021-08-09 07:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a98a8cf642ccaead6d3d20c43450981 SHA-1: 18a9549a46ac78b248ec4ec24b7ec4719d5d01da SHA-256: c38219251be1afbb793174645310b887941e13c8a175d0a30178fae827b92342
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to download and execute additional malicious content. The presence of multiple links pointing to compromised CMS upload directories and disposable hosting suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/a397d6a3c4ef5430913593c15cf60f5c/zulipafidaxetojevimubofos.pdf In PDF document text
    • http://prosquash.by/data/76041098677.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/91207946405.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/wisutexenupoxa.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/1568e3782d8b4651821119984a8a8e1b/10294961405.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/vewimubuniloz.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/18f8cdf349ae70b1fe80ae369d1fd1cd/lanofod.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a04e72eb56c---savepidarov.pdfIn PDF document text
    • http://builderall.info/userfiles/file/zivuvoburojuvididiv.pdfIn PDF document text
    • https://besi.co/ckfinder/userfiles/files/57381680262.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/6589388851.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/2f1cfth105o6kcanavvlocatm5/11193893304.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/6490ca4a06a88bf133654d7685686fa6/12352091878.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087a98c8e4f6---87176071131.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/j7irm7li7he0t2confp9pmpd5f/fawabifasagigozotor.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/61525818150.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160726e23bea3d---mezaga.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/20238343155.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/7b8ad7fb88c96deaaf30f635f57e039a/6834411172.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/f9ceb625817e0c47d9bef29f0f8c5710/91994535936.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16076fb3311bd3---jekufavibukolewasonuna.pdfIn PDF document text
    • https://badrivishal.com/media/samenotogimuraditir.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/bikure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+is+teleconferencing+brainlyPDF 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_off0001a57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A57B 17980 bytes
SHA-256: d631e0f50bb2a29f9bff880c0df30018e8537e0090e505fedf90036d75b1e7ba
font_01_sfnt_off0001d47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D47D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC94 10864 bytes
SHA-256: 2a2b10f554dec192425bfeb864460d9423cb82e43f4d96104ba428979706c332

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