Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9486cb7c165fe4b…

MALICIOUS

PDF

74.2 KB Created: 2021-09-05 09:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a9612b8873ef8bee0ae9a982a6a483ab SHA-1: 90713db59969f4cc0e6bb361db261b66924f17ff SHA-256: b9486cb7c165fe4b7fd838f93b251231a0be43af749b1bcde682cebc0a958994
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/7fe44f7cce602538b86332859c936ab9/77437679674.pdf In PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/devubitebidepoduxikojosu.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/477587b6a28b07e0021608ed7f9350b5/nekokanidekixesezaluf.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160973478ca5b6---javozigibe.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/55773517868.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/3ehpkettqskoact7jhivhn3i50/93340054630.pdfIn PDF document text
    • https://citytrafik.nu/images/file/80472481827.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/sopibarobiwe.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076c968b3b26---gotezafis.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/dobupixajo.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b62089a434f---48215475719.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/pediweza.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/493b158c54683c87a81e8ade8710aef9/bosivoluk.pdfIn PDF document text
    • https://blogsma.com/files/nevotot.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/fab028a4457db0d771f6e0af7368ddea/4306774110.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ab65b2b53---34196097743.pdfIn PDF document text
    • https://cecprint.com/images/file/51272549803.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/tezafofezemizife.pdfIn PDF document text
    • https://lesura.net/userfiles/file/guwigojuroganalexu.pdfIn PDF document text
    • http://potlista.com/file/files/motipewa.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/xudasefenek.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094078685f7e---guxutubasuwaworekitex.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/94160179526.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/zalovo.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/35086020037.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff292622e6---20855679306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=quadratic+equations+with+imaginary+solutions+worksheetPDF 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_off0000bf59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF59 11416 bytes
SHA-256: fd30517a777bb46607fd9b0a13e3d8e9796aac59910baf013adb91ac99fc3ed6
font_01_sfnt_off0000d9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B8 16020 bytes
SHA-256: 6214b67ae0c7f4e543a3ac0a13ae5763f0de546e31fb146531623e73ee922c76
font_02_sfnt_off000102b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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