Malicious PDF — malware analysis report

Static analysis result for SHA-256 f60687847117ea8c…

MALICIOUS

PDF

77.1 KB Created: 2021-10-01 04:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 556739021b37a6f215067f35381c0232 SHA-1: 89a075d3293dec4ca446c2152ca51c75baf0d24e SHA-256: f60687847117ea8c981c074dfc5394fb8e2faa33d9a7d9fba8a23f8a653c7b75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://wastran.ru/uplcv?utm_term=polynomials+area+and+perimeter+worksheet+answer+key PDF link annotation
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dfb01c0107---111431026.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/xenozumiruwa.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0190cacb8cd2ed97b1a520d5126f437a/jasatalelafonamuse.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/gawepuwowoj.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/jetokogilokikomawasuv.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/47516736316.pdfIn PDF document text
    • https://autoskola-scp.com/files/35474232675.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/kuzagasirabobixonud.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/totataxegitiladeku.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/54248497440.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/85322926556.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/71130251855.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/kefirogotuwutubigajekawu.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/kemaxijujono.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/jajigikutuzileja.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/tazubawabe.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/4536532470.pdfIn PDF document text
    • http://labotinnghia.com/img/files/kiworipubujuzijatosez.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/20937809948.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/72621776083.pdfIn PDF document text
    • https://lasanisports.com/files/29868114377.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/ragixixurusezejenuwera.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1632392461_1.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210905140310.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/53644320959.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161471c0ba7e58---61842998592.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_off0000c24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24B 19196 bytes
SHA-256: 5c63de4876e119bd3ef6ae726b55d148693e5d125801bfe0a1f93cfd3f9ed962
font_01_sfnt_off0000f4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC4 10948 bytes
SHA-256: abedca5679b0a1f9719316b5872898a9487d547a7d7904c66c3a765f0d24fb14

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