Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a4483cc1710b20…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 15:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 59f6a2feb63d399f37515d21963c911b SHA-1: 4a38fc9edbb3c991c36553570e94cbff5fa7c54a SHA-256: b6a4483cc1710b20641a6f53396e1e716fcacfc26c9b0124f7e600ed2ac028f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613626472bfa7---noneva.pdf In PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/lonewikedagebupiz.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/nabikadeduvak.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/wisubijefamiritu.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/ee6f4656a3ba5bfc24992d29c6559d3c/manakamesegeveb.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/41756543201.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/2405687382.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/wazipitotimagemuzebu.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/071021285633.pdfIn PDF document text
    • http://topstec.com/d/files/gajazuxagemiwobabage.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/nosexuvof.pdfIn PDF document text
    • http://webbuilders.com/files/file/libapumevuf.pdfIn PDF document text
    • https://medpressa.ru/files/file/97452675910.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/80702400459.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/xofofamezupamis.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/j8e4hrdc0s5if21m9epkvgdau2/resagofuvudaketep.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/pinejalitegoloxagajalade.pdfIn PDF document text
    • https://renetravel.ro/images/files/57760389575.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/fazarukufese.pdfIn PDF document text
    • http://www.celso.org/download/kukopowinasoninoxefesiraw.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/romal.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/4478137149.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/31143342429.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/uhkpa7ot69vrb2v9svdn3hvnm4/baniguwiwumako.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/67118622950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pubg+mobile+download+android+phonePDF 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_off0000dc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC83 17572 bytes
SHA-256: f516296fbe2b1befa16f4217f645e79266beb9f7daf6f6b64eb6f76d3059cb55
font_01_sfnt_off00010970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12187 10900 bytes
SHA-256: 5e74e125787c77a11bc4cb73f0a7dc2f9444ffdb30fdd529fa37e44025ac6744

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