Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d3b37c05795930…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 07:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f1f6a64a13c423e89d365225fc9ad7ce SHA-1: d7d54e7ba8bb92c14997121e0494f6053950733e SHA-256: b8d3b37c0579593049391189bb5d4561c33e8912f0419c7ac236b323f8982948
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs and is flagged as a link farm, with several heuristics indicating malicious intent. ClamAV detection and ML classification further support its malicious nature. The presence of external URIs and link farms suggests an attempt to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=android+lock+screen+brightness PDF link annotation
    • http://tantusmarina.com/UserFiles/file/18194551806.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/51465392008.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/72213177902.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109181610541287.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/28403573742.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/kozokebaduw.pdfIn PDF document text
    • http://polipack.ru/content/file/97826606458.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/tosopif.pdfIn PDF document text
    • http://k1a.ru/images/files/file/33812064431.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/32e778da8a9f394d034cb0ef0c19cf37/2898937194.pdfIn PDF document text
    • http://annabarons.lv/files/files/82500964536.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132712bd783c---matitoxetowarurunotoxupun.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/169af78879c1c3eb98f72b4c47b4f84d/73352426402.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210912220136.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/30175312509.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/kopoza.pdfIn PDF document text
    • http://pnalog.ru/images/file/20030839470.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/5524194379.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/fidarixuraniluguzo.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/pujamigaseropukekikikirev.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/tumifekixabukivumigusewir.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16147cb94dc939---24165411633.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/64708669109.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/turilusakulevuwapi.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_off0000e0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B4 10700 bytes
SHA-256: 7da2927e835c6161f9ce9d5e5ca46f8e3faf82af1073c9c5be6b3e3a53756f6d
font_01_sfnt_off0000f8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001110e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110E 16528 bytes
SHA-256: 3b770e6bd71615b1b84d6d0c74c63fde2fd674055958097e16e059df866d4e27

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