Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5372cb168de6274…

MALICIOUS

PDF

67.4 KB Created: 2021-10-04 05:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fb868a3550fe1b268980d5335700b74a SHA-1: cf0e9f78961cbcf1729126fc167ade5354d6057a SHA-256: b5372cb168de6274498973acb1ae8cf1ddcace44847f4a123bf46bd723350bbf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure with an image overlay and embedded links. Multiple heuristics indicate a link farm pointing to potentially compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. Although no scripts were directly extracted, the structure and URL patterns are consistent with malware delivery or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://asiastudy.in/ckfinder/userfiles/files/43068572382.pdf In PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/1215048314.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/18409920856.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210903095930.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/67394177372.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/fukudulelemiziravevoxeka.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8a6f24338---wefewefomo.pdfIn PDF document text
    • http://erimti.com/userfiles/file/salilutelurerubar.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/xubetewukumi.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/lojaf.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0645a97dc---zonaxulevex.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/33901320267.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/12295447098.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/97187468492.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/32952375052.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/560645dbb9ca8649a4cf70023150247b/xisemafupivadogej.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/44592144377.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/fusitugopalopapibadu.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/60771717240.pdfIn PDF document text
    • https://angkalaris.com/contents/files/68991620934.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/52915774997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=brother+dcp+150c+user+manualPDF 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_off0000aafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAFE 11148 bytes
SHA-256: ace9dd77ea6bd15c69c68e6d137018a46351724ed39ea7a0c91731b7518dde08
font_01_sfnt_off0000c4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F3 14088 bytes
SHA-256: ef90885ed9a6ab4833df0a1b0f5602d85dfb1f3545efec8aec30da239d2d1561
font_02_sfnt_off0000e811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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