Malicious PDF — malware analysis report

Static analysis result for SHA-256 64708c117fc34850…

MALICIOUS

PDF

89.4 KB Created: 2021-09-17 06:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d6931e07179ccd9e4855f847a632b5c8 SHA-1: 81644c26e2622a7b533b5e5e38ce49f3ce7ef492 SHA-256: 64708c117fc34850beb110caebbe3f1d7a83a08e54144fe80ed2ec241d16999b
176 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. 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 'QR code lure' heuristic further supports the phishing pretext, encouraging users to scan a code with their mobile devices.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://cructi.ru/uplcv?utm_term=how+to+open+voicemail+on+android PDF link annotation
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e86621bb7f---48064318102.pdfIn PDF document text
    • https://superlitefan.com/uploads/files/jifopoxaraj.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/rebinov.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/92087300672.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/nupukebepedanazasowexe.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a438800a1---93862961297.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/31754946300.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/54838904771.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/buxil.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210917103222.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/73917066991.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/4982036266.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f2d66ab2---13810910490.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/sixerifuduvezisodojoni.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161303f105084c---24052512817.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/vudirurovumu.pdfIn PDF document text
    • http://marketingnews.fr/images/file/55849358291.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/64662985008.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c50e204c9---86048550354.pdfIn PDF document text
    • http://puisan.ru/uploads/file/mozebenuluk.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/28532127283.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/fafisevesefutakexisifa.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/damufupulegixamoxi.pdfIn PDF document text
    • http://wohingltd.com/userfiles/velujuvoxazijab.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/kotasebusajarelugo.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/73641963640.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_off0000f897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A9 17960 bytes
SHA-256: d986968faca5cdda6149e7265d0c7c165e6e6430bd13570713460f86621ddb29
font_02_sfnt_off00013f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0E 10648 bytes
SHA-256: 504969413a03b2c0d46cdaa650f61a1a301a1d3a2e2ce3c27c0a530d6f46bd4f

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