Malicious PDF — malware analysis report

Static analysis result for SHA-256 73eefba138aa714b…

MALICIOUS

PDF

106.4 KB Created: 2021-09-16 02:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9d10da1375afaddd000029c01414ab59 SHA-1: dcb0289e5d6a1fd4fd082066b3bcbb4e89910bf1 SHA-256: 73eefba138aa714b53906d94ca5f1f68c1b3d4d3b6875f876e64e99bf757fa3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and a high number of distinct hosts in the link farm further supports this. No scripts were extracted, but the overall structure and heuristic firings point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/51287932464.pdf In PDF document text
    • http://begues.mobi/userfiles/file/33941385986.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021091221154836.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/saxedofurelegefikolo.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/dibavuvokoridololudi.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/linomomugudozana.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/98088463013.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/gisevotuvoru.pdfIn PDF document text
    • https://123natura.com/stockages/files/33792672557.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/95187902468.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161426a2586746---22021711103.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b486d3d19---gidotoze.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/bufelowomo.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/23807325693.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/dujib.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/vezitomunuzofire.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/gegifigugatuvixoroku.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210908023424.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/ritinusinubenuze.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/xapes.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/73945070192.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210901_090519.pdfIn PDF document text
    • http://clingac.com/d/files/57785049918.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16140e17581d6c---kobarimipukof.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/4739275411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=fortnite+redeem+codes+for+skinsPDF 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_off000134d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D0 20784 bytes
SHA-256: 56337b26c08450597a88182a541dab4c1a844ee505ceea4e26c290ca93b56c24
font_01_sfnt_off00016bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BB1 10496 bytes
SHA-256: b2fa40724b7900d8a9d5a6971481c4f830bfd4922834021964fe2f8ee60a0e42
font_02_sfnt_off0001838e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1838E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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