Malicious PDF — malware analysis report

Static analysis result for SHA-256 de543239a515d167…

MALICIOUS

PDF

91.2 KB Created: 2021-09-01 03:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a61e596dc5d7eac2f9db7f28c471adb SHA-1: fd89d190de023849e0a5e0d92ea24444b8d36a06 SHA-256: de543239a515d1671fb8bd2aa9304e692ff4abec473b46d2af8bd24632586164
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to phishing or malware hosting sites. The presence of multiple external URIs and link farm indicators strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://stinpo.com/ckfinder/userfiles/files/zokitisirilitoriv.pdf In PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/110ecb19fc409947cd9a7fa70495d924/34355149304.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/8c84e0f4a2b8670caee75dd4f0530d0f/fegisajosoluwotatij.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/81603404579.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/94362778aa7db83050b340854269375e/26751264637.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/70359955494.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/pukozujubakawutokugurubow.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16076f37eb2d10---87975597608.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/e5jkud1gaaggct7tucp1pi8pju/rokalemotegikomujogagoxaw.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fea3e73a6b8---mezokarizotudozetixugu.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079d729517bc---kadafejo.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/98b98ff861efa8788d680f4b20ec768c/vuwirobuva.pdfIn PDF document text
    • https://mtmhomeschool.com/mycms/uploadedimages/editorUploadedImages/file/83660495689.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/31646905321.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/jilipibisoxonu.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/5d85c7cfc0bc395686ad333118a8c063/26695824856.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608455abc2baf---xikofitus.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/50082c33bb145da97aced1104a3c7f5b/52528842706.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/60c97c0d496f1aadef168dff02f3c96c/42242885503.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/hua3po6sc86ptpr97vs6q2erfc/kalimixerekegonav.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/sunarexudam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=periodic+table+puzzles+answersPDF 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_off0000fcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDF 10892 bytes
SHA-256: fcc6bd4de4b160099c322185753852f5aba6a89890bd00839eae156e4d568d10
font_01_sfnt_off0001160c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160C 18876 bytes
SHA-256: c9869e555dddc26521355cd95d57d7c5ca11a747598ce27d4fed80aba953fb93
font_02_sfnt_off000146d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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