Malicious PDF — malware analysis report

Static analysis result for SHA-256 c96471ef6409f1bb…

MALICIOUS

PDF

83.3 KB Created: 2021-09-14 19:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 109257cdc6e3a03020ba7a6866bfe808 SHA-1: be3431f538abe91b05001230c2d2244230e33e01 SHA-256: c96471ef6409f1bbd137b45609d40a0b0f453c4f7d390955e2e5e079f906af4c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, forming a link farm. These links likely serve to obscure the ultimate destination, which is probably a phishing page or a malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=aplikasi+microsoft+excel+untuk+android PDF link annotation
    • http://fornacedelia.it/userfiles/files/rofivofijomazuwu.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/pesamunejidifa.pdfIn PDF document text
    • http://smirna.pl/files/file/rawowukupazu.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/divajiwatagolevire.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/7588308710.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/kituweraxazoriluvaz.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/15949148463.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/186dbfca11bc3bd6bcd9402deb5fd0e6/kivimijapavikumo.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/nuzakakenutawelare.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/supemodilifip.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/gexararipifibufaromajag.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/87681264240.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/gufarapeborerumasik.pdfIn PDF document text
    • http://adice-area.com/pictures/files/19718696703.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb2f208570---kulikosurukedixo.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613f311eb3c89---30329483852.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/jimejisutaduveza.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/43152685940.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/66467474516.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/64892525274.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/32903996219.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/gatoto.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/domuxiwola.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/jefazejabaxil.pdfIn PDF document text
    • 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_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF989 11056 bytes
SHA-256: b57fbe4d57a6226584b02d24e1bb86b07ffb87368d48135ad6168153fc7d92c3
font_02_sfnt_off0001134e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134E 17072 bytes
SHA-256: 893ca8644f101ad62dd6bee76cc780c398fbd69dac3bc2999caa202ed927f808

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