Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e171eb6d1e9c87…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 07:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ce55a53df135c555dc6180e26bb9b2ce SHA-1: 3eddd2aa0cd00674eb95b18d8c61a11dcc829066 SHA-256: 10e171eb6d1e9c87f7bc0871852a05793c7ca7f1a0a1d62cc02d221e764b3def
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous external URIs, including one pointing to a raw IP address, suggesting it is part of a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • 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://bya-ingenieria.com/ckfinder/userfiles/files/78538010758.pdf In PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/4cc3ca267e84019a158e2da1b2aa80ac/lowura.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/c7ul37vtmv2h3ialnc86upntjf/90271905153.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2863499c7---tegedenasixavawisefuziwux.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16116ea911859f---bidek.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/9826994972.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8a09cece4---10525333796.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/281231166278.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16264254964862.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/tosuwoxezuvezitozisapaw.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/zisepotewopatapelit.pdfIn PDF document text
    • http://ahchala.com/img/file/fujugawani.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/bb8c595960b48d07ff4cc96d8a6f6f80/tojaziginebijugipepuze.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/im4kcdliou1qaujq3dfnsiopo7/21152832699.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/valopuzes.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c887a4c11a---nokikinojijokolamuwip.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/39600722615.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdcf3db4d3---74620808892.pdfPDF link annotation
    • http://weforyou.it/userfiles/files/dulikizifasadikadipetimen.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/38662216463.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cf25hh6jrrub1vr71p6amik2l3/wofaruvilafinukaxuwuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tabla+de+conversiones+de+temperatura+celsius+fahrenheit+kelvin+pdfPDF 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_off0000d4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B9 19636 bytes
SHA-256: a0b64715fec5bd2c1e62c3f09c573d4360e817754b8ccc213a97156beae8b5e1
font_01_sfnt_off0001067e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E95 11248 bytes
SHA-256: 42a2c8062ccb8647f1546244120b7a66a6ff6108524856c6527dbb6d764c919d

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