Malicious PDF — malware analysis report

Static analysis result for SHA-256 273c5bb6858adecb…

MALICIOUS

PDF

77.3 KB Created: 2021-09-08 01:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c93332f9d628c224867ba6a2437618cd SHA-1: 9ac6238a11fe9110d76c3585e684ba2ee2cf1ab7 SHA-256: 273c5bb6858adecb93dbba9ffbcb5e8f2adbeeacea5ae6ceb56d221e54945b8c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links align with techniques used to lure users into malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://kurtwohndesign.ch/userfiles/files/80249740673.pdf In PDF document text
    • https://aordonez.com/images/contenidos/files/13338641682.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/japusid.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/61030148970.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/us1ij7clhj3vgk03v334frt2dq/fojaribofupu.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/wekabojanovu.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/16560570865.pdfIn PDF document text
    • http://allasclub.com/campannas/file/bubifafefukinitekukalijox.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/59067131737.pdfIn PDF document text
    • https://nistd.in/userfiles/file/21696981687.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612993771eaf5---jusomefijemanixon.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16072c8d626dba---53140735735.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/10299250528.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/63288263620.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/5dgkag88uqvm6jn5b9hginipoo/27923073193.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081209feeed3---40627657537.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/mefigo.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daeca6ac4cf---8222825226.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070128d8d7ab---26258868048.pdfIn PDF document text
    • https://raljob.com/userfiles/file/84182304955.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/1uq1mrm3pe7t19lqabnu7to95i/zegedagogale.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/42948020394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=headway+intermediate+pdf+third+editionPDF 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_off0000c780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC780 10740 bytes
SHA-256: e6b886b6929e6d85edcd4bb944604e447ec271b99c985ec2b3d1e26c05220f3a
font_01_sfnt_off0000dfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 17904 bytes
SHA-256: 189894ca68d8ef033190808ca240450ee150106f0be0a791078fe766fce7d1e8
font_02_sfnt_off00010f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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