Malicious PDF — malware analysis report

Static analysis result for SHA-256 29441e6ca4f74e49…

MALICIOUS

PDF

131.0 KB Created: 2021-06-20 02:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7a7efa13730c3ef76a9f62d38fa2df7d SHA-1: 79fc2b0985f19888f03965efdb614bc674677e76 SHA-256: 29441e6ca4f74e49804b4e4f6c268b1d416f909331d4324fdc06a1daeb3530c2
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607119d45d2eb---woradez.pdf In PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609457555d297---11894680784.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/dufena.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c320fae3aff---56242171023.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3ac80cc5e---63107203185.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/41070064517.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d782c32f77---40210947345.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/bufunibewixutifokiz.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/metedavaxezejura.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/bimavefakuvare.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/92822485198.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7e436fab22d44281415fbdceaa90283a/jemilupemis.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/mikutefege.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/85915896482.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16077c10b34cad---33079321831.pdfIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=train+to+busan+telegram+linkPDF 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
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001901d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1901D 5080 bytes
SHA-256: 746ca3429cdcdf8875c9fbb9375053815ac68a39c8bc598f4a8fc586c42ae1f2
font_00_sfnt_off00017f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F1E 5040 bytes
SHA-256: 56bcf2af60387d1f374e9d6bad563c55e0afb9e78ed6a00564f3d752def154bf
font_02_sfnt_off0001a302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A302 2424 bytes
SHA-256: 9059473c4baf4b2df1d14404b0b0560d5a57f7b82054dcb55b5a5bda586094e2
font_03_sfnt_off0001ac82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC82 13140 bytes
SHA-256: caf02ee8e13184d545e6d623323e5ba9e65c4e658647c7e81619f23afcea32f5
font_04_sfnt_off0001d795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D795 16392 bytes
SHA-256: a82572ff0dca19cecca50dcda055430e6d101f8deede62e8c4e449594a78bfaf
font_05_sfnt_off0001ed7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED7D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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