Malicious PDF — malware analysis report

Static analysis result for SHA-256 38059ce00f1d0dfe…

MALICIOUS

PDF

103.7 KB Created: 2021-09-06 13:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f31e8ab8244888847618a2f19f31d1a5 SHA-1: 93025884628c7f56a2de1e654fdbbd4660a3ba64 SHA-256: 38059ce00f1d0dfec5a571fb0763c878c47bf73c6afd3b3aaf0996694dcb5383
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a link farm directing users to multiple external URLs, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://yoron.net/up/files/letapetajojinosaxovalata.pdf In PDF document text
    • http://activesolutionelectric.com/images/file/78461198510.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/302f8cbbb57250a1d49af307b6cefbb6/liwiwixazudalirakifadomi.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/sedule.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/lupipexiradom.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/36385221477.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/hfl58bp95mqqggn809he8942b5/88569543883.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/kegamot.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/53645063232.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/3b8fdfb299a6f2f8e495dbc9a22127a0/padesofipomazodufolozojar.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0954c3c6e---48850902331.pdfIn PDF document text
    • http://kisito.com/userfiles/file/87462634867.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/63930604559.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/go4qng8jhq5k1vigmmntvbe013/fatuluf.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/bogatixiwo.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/guvofurevunobadagefevo.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/kutaxazaji.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b48da8aaf4---93732367431.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/kijal.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/gipozodexejusozituram.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/punidibit.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/56753935810.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/82205913438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ndt+radiographic+testing+procedure+pdfPDF 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_off00012eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EED 10932 bytes
SHA-256: 60eea21a8308daff7ccb75d24725beae931d3ff66de403e22750566a7b3b6697
font_01_sfnt_off00014804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14804 18664 bytes
SHA-256: f5f650d57fa663ae406a97d309f37edbcc971402c21d11cf2802f5a82ac838f3
font_02_sfnt_off000178b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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