Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73d309149be59b5…

MALICIOUS

PDF

72.3 KB Created: 2021-09-20 21:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4bcb253a0830ff5ac4c620f86fbfb350 SHA-1: 7766249ce26558b9148189125f2ce6fdcf22cdda SHA-256: a73d309149be59b5d74b8f72817dd3567993d862e10500f1fa5f0a92bc6b4fea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The PDF structure and URL patterns are consistent with a malicious document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://travellifeafrica.com/ci/userfiles/files/81070589597.pdf In PDF document text
    • http://www.ufolep-69.com/contenus/files/29283495941.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tf4envgsnc91lja239lfib3uvm/savokagiwagu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac4e72615e---5372123155.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416f21c17fe---tidori.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/lalujuzudedesu.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/wopesuwuno.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/1347995871.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/40541581332.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/23049335641.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/83190404880.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/53214252714.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed01436d6b---56412393930.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/55602541765.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/lukurepugunopejaw.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16145303c7e67f---nalarujemojoxeludive.pdfIn PDF document text
    • http://hidramaco.com/files/files/zowewisawafaz.pdfIn PDF document text
    • http://topp.pl/_topp/file/26778919374.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/64697399997.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/16976176261.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109011827123276.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/42838509110.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/24011077073.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/48238113364.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1630559147satozalumaliwulagokuseb.pdfIn PDF document text
    • http://megalaserasia.com/upload///87631347806.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/89177311886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=lightroom+download+mod+apkPDF 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_off0000b803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB803 16940 bytes
SHA-256: 33b34425d9e81fce1b38e5c0068975fdabc9aeebdc065460292e1cebe6cabad1
font_01_sfnt_off0000e30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 10672 bytes
SHA-256: 34c8709d85701555e80416e248ae6ea2920090ce90992f0bc77064937fda60d5

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