Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6711555da78e09…

MALICIOUS

PDF

97.1 KB Created: 2021-07-25 09:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5febad0dc064f874b3bbb0f751489ca3 SHA-1: d1330e3614876d607dbda58756b177dc32836e63 SHA-256: 3d6711555da78e09148664d7049a84305290de2ea02c270558e1c42bee2b1f0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and numerous external links point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160982c2b3a1c5---karuxekate.pdf In PDF document text
    • http://nuraski.pl/wsg/userfiles/buzugifisijunulifa.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/jurupoxogonolewizevotor.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/lufo46ck78kegrcs62l9j6ppr6/nikezo.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0e690aee19a1e6f431844d39f5b263e6/sebilijekigumirat.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/90136829547.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc68693be2f---fononitulanorizu.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/23817279123.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/40155065629.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823162ad7e0---90314526231.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/d192f7f33c348108228256956db4fa70/lazagof.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de9b4b036c---83597081829.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/55634508637.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ga51ml72c4ve2gmgr7ktorq1rb/44387113812.pdfIn PDF document text
    • https://chpcentre.com/files/file/pejemuwifutifu.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021072310541173499.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/60554808120.pdfIn PDF document text
    • http://meadclassof1991.com/clients/c/cc/cc689d7a74a098ef67b43942063c7ff9/File/jesatugosikesivoligilakor.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c2200bfce---31461317490.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092c6df979a2---jitosonupuvafi.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/92647bd039f8c8d2281fe3d380457a13/38675492384.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de1b9f2e736---13201306516.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/1vvgvsc19smjptjnqs4d76i11g/jevujonuweworaxuwilisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ejercicios+formulacion+organica+1+bachilleratoPDF 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_off00010f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12775 11188 bytes
SHA-256: 65e1f341ab9c67d2d8ace6e99addfc49ced72c9a679f55b9119917824c5c5813
font_02_sfnt_off00014172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14172 20092 bytes
SHA-256: 833bdf03be52f70cc8ff128c61f2a47bf526c861cb0b20d766709cfab00d131b

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