Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a7c4870367de29…

MALICIOUS

PDF

78.1 KB Created: 2021-11-13 07:06:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 73af520cd5ac3ef5a414504766659ddf SHA-1: 238d1e755fa172eb997fe59361ad9fa5dfe78fa0 SHA-256: 84a7c4870367de2923296a69d7415a8da2f08a4eead54a8f7397b2e209ff4b96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal that the document functions as a link farm, directing users to compromised WordPress upload storage. The presence of multiple URLs pointing to such compromised sites suggests an attempt to distribute further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a182e971c---6353590972.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/80012805665.pdfIn PDF document text
    • https://chptravel.ir/data/file/94162011942.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/zewazanebadebexasatuf.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/13825084386.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/xebekojago.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/8886929898.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7d97dc15---jomuretol.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/de42913ddbfadc6fd941c66fff27f5a7/vafoledobuboxa.pdfIn PDF document text
    • https://melz-feu.ru/upload/91923013784.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/19503062803.pdfIn PDF document text
    • http://lblussana.it/images/file/busitolubexurinuxo.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/defesaguxi.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/64620465182.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614313fe1fad5---wewebelogutonogoj.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/92371463303.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210911_51C9D9A249A4119F.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/jorupugome.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/69184519926.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5882c9e93---vokoxivesolob.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/sojel.pdfIn PDF document text
    • http://anninhsieuthi.online/upload/files/marevisitimos.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/78198513554.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/13483489994.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/BGAemAmcdTc/uplcv?utm_term=mini+project+for+computer+sciencePDF 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_off0000cc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC43 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_01_sfnt_off0000e364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE364 17868 bytes
SHA-256: b74be7d286d17530f27c3213beda347f0d6dbf693c670de82a4056a5fe318922
font_02_sfnt_off0001121f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121F 10656 bytes
SHA-256: 3fbb471cf563ea1a730f7f1958646befd02195e579c429438472a502e8fcffff

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