Malicious PDF — malware analysis report

Static analysis result for SHA-256 2738749cb19f04ba…

MALICIOUS

PDF

85.4 KB Created: 2021-10-14 12:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b593074a93060750e5d3abb6eab01fd1 SHA-1: 9d4a70ed929406a0b67a4aa1014fd58ac3a1131a SHA-256: 2738749cb19f04ba5ddbfa5ce35f4c5783beeab81682f3f79148922c4bc8b8d6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=jericho+archaeological+site PDF link annotation
    • http://covina.crazyrockinsushi.com/uploads/files/43076004193.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/96103661154.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/4237562569.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16156083f2bfb9---navigasewivisoju.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/852f20bcfecd7bd82712b6021fe6d64d/pabol.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/niwukeregowenezobax.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/nejikagegudowudomamu.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/zetawa.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/65021638392.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161556eef59518---segumezilekefalu.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/rirasalexatelezesoxoxaru.pdfIn PDF document text
    • http://esteel.my/userfiles/file/kitevixuxig.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/pinetenap.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/50284619683.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/36445203388.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/1101996416.pdfIn PDF document text
    • http://52963566.com/upload/file/202109040556243067.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/906753820.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/62009663483.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/guwejodawoguvoradono.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/95050346962.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/6750927028.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/43859925848.pdfIn PDF document text
    • 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_off0000e80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80C 10396 bytes
SHA-256: b286edfd9cdfa40b67327d2acb4c27af9d6573bc79302464f340bd1e9bb72e52
font_01_sfnt_off0000ffc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D5 18620 bytes
SHA-256: c645f25853b99325508875d6d71b03b1c2b4edd3148004423f2cc0f193a53542