Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b0c531ffc680a3…

MALICIOUS

PDF

90.1 KB Created: 2021-08-30 15:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e601e17b4f6fd12f27bb5588659c0ac SHA-1: bff98e874446eab120420efb13d7ecc3d69182f4 SHA-256: 65b0c531ffc680a3b09bd32ffa7a79d54087202f99bbac92069ecfbea0c8aa24
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nomylo.ru/uplcv?utm_term=write+an+email+to+a+friend+about+your+holiday PDF link annotation
    • https://tipresentoio.it/images/file/dafujixujaxepefu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/acivgslqlakgvdmipht4uhuhi4/29575549889.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/37a9423a7a06302f38a631f866b52e59/bibugano.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c705b5d0a09---jorekowupodutatolezaj.pdfIn PDF document text
    • https://ksuskalology.com/images/file/33797887466.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/mutijajosasakevinusewib.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/jovajilixigumunodemilevi.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/nrsdqgtfojgvg6v7f9rim3q4fd/92530966636.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/44251ddd292024ff6d3b089937421781/35001971163.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/11655806789.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/7600056762.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/kekafatu.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/deferanurinewufonuxa.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/17406094594.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/purudatasil.pdfIn PDF document text
    • https://ikima.fr/uploads/file/44806866915.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/5654600896.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/nosesijilupamidad.pdfIn PDF document text
    • https://bataretak.com/img/files/file/13406926443.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070e738207e6---32326810084.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/2khofm36pljlconm3ismni81k5/papelipinagixivaresixav.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/bufopisogifi.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751ceea67d3---97358358477.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/muvupej.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/tnr87gv4j7j0td6e0h3f0djptt/46948174892.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/64397dd27bdcf9321d73efe13d2b270d/bowodowutunupilike.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4lnaqp4oit8ea7q8uneit4ng5m/66544420579.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_off0000fb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 17616 bytes
SHA-256: 0bbb9da48d1afa7d444cd253012a258e9e127a74ddfa083fc56b219da08fbbd5
font_01_sfnt_off00012918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12918 10800 bytes
SHA-256: 9c2c974e7a30034ce0e349cc7c79563cff13c41b1684a57c6633cd314cbbc382
font_02_sfnt_off000141bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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