Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c53edfcfe42334e…

MALICIOUS

PDF

101.6 KB Created: 2021-08-15 15:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6880e8fbc8515a14e0e2183b282e02cc SHA-1: 5173dc44481451132c10aa72f7d4bd5054a8988c SHA-256: 2c53edfcfe42334ee5f4bc0ebedb6f6f591a0bee50c89a340cba51b04eccfe73
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, some hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and SE_URGENCY_LURE heuristics further supports a phishing or scam-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crysiq.ru/uplcv?utm_term=how+to+value+pokemon+cards+australia PDF link annotation
    • http://brandnewgoods.net/userfiles/file/33272139425.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/kokigelegevur.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/kalarebex.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/21470414252.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-7-28/20210728153404713453.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/13007373865.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/76347413152.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/e0b17osul8v4s2r4u91439sbae/45264820355.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc97a29614---10207788863.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b8803281c---60033571706.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/160513131510.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/8729349322.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210611110340.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/kajivekopufigisagujexij.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/79523868619.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073d9b2d58c7---nalilosiwijudamidozaxeme.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/46615647923.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/16679875234.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/205557b9ce3517e5502c8afc9e121276/vekajowesawenopemon.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083e653ddafc---wutipufe.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/68445775615.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d81212d7887---94972306845.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00014e90.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14E90 19072 bytes
SHA-256: 052a9bbf405447a3c6ead8cdd6d91fc24e1fd94233dcd682184909db5417acd8
font_00_sfnt_off000104da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DA 19072 bytes
SHA-256: e536fef7a82a1429b48cc218d3495724bb947dd976ef7f9ea551b705fa7157e0
font_01_sfnt_off000134fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FC 11012 bytes
SHA-256: 39a48a6b1310951c5378525f2c90ff6feae0a130a8d222b583f7e798fc4597e1
font_03_sfnt_off00016e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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