Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff3d6b54acfe48f…

MALICIOUS

PDF

110.6 KB Created: 2021-07-14 08:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 87db7e11daf8713d8242955c43214833 SHA-1: 5121a292cc6754b4c62bcdf3179b99f4740c2bee SHA-256: 9ff3d6b54acfe48fe397e0e515856024ca0c81f19c23e556c2f56db444af65e6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous URLs that point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/82257719040.pdf In PDF document text
    • http://udclassof1968.com/clients/74076/File/91686265947.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/48256771180.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/dukexedufa.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ceec3491f---14439729563.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/6b5e69d9968b8f3296e23c48ea1fa861/5581108036.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16077035a47987---tokos.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073662b59631---65645580706.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/75055618426.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/17006761137.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/36749072262.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/6bf8af3c0015b6b6b4579d94c06dc427/62279223071.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4ffac79de70ac8189f72aeac1d77beaf/futugit.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706223036f5---12831899373.pdfPDF link annotation
    • http://viprealestatebrokers.com/userfiles/files/rowupegotonewuzixu.pdfIn PDF document text
    • https://wsbtitan.com/images/file/49713309284.pdfIn PDF document text
    • http://susutour.com/userfile/file/nasevijirojivifumipoweseb.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f55f0a62c---23457659274.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/29134667497.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2675cb67b---fodabowokelo.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/3bgcus1o60l8u3ij8cuu0sm1h6/33260072774.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5ef5b87e1---xewadaxorefalidizutewadi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=trobriand+islands+anthropologyPDF 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_off000150f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F9 17060 bytes
SHA-256: a9022f466c0731f997f135efaf3e4e7ce97a2fae50d267e7536da760e395b4b6
font_01_sfnt_off00017cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CF6 10756 bytes
SHA-256: de60eaac8e70c51c94622f36bb6a495fcdb9df6a06b0325520e484a951b3fda7
font_02_sfnt_off0001952b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1952B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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