Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bc02119d833bf6…

MALICIOUS

PDF

248.9 KB Created: 2021-08-09 06:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: fab03030b3b7343f08f3a5036257736c SHA-1: dc6cb6009eadc03e9a12940a525ea650f6f86d14 SHA-256: b8bc02119d833bf640f9e54a84cd45ba1ba38712908d401e2b1ad8d6d4c5b519
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates that the document contains links pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content. The 'SE_CALLBACK_LURE' heuristic further suggests a phishing or scam pretext, likely to trick users into interacting with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/5bdbb59a8d10e20f5ff9fe2b996fb84a/wojalowakapetax.pdf In PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/51277330009.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/kofalipaba.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e21ebbdaff3---84079962230.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/womakugezekeri.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/80073556344.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e029d9c01fa---doderobukaje.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/rotavofinirowesow.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/73424750516.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/83482107296.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/16572875273.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7396c30db9---nodixobowozugaduwuvizegif.pdfIn PDF document text
    • http://holyfamilycyo.org/clients/37654/File/35285906020.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/17161206706.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cbaa7659d---bebabinagu.pdfIn PDF document text
    • http://hncastlecable.com/d/files/31654726200.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16091c46d0a3ed---53136308766.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/wemilinajadavodizebaz.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/41881159195.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c5c49ae2b---lumemub.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/d2ca25013c7d002393f8b51680d41ebd/bifivo.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98171428244.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/63998578266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=why+is+my+ryobi+charger+flashing+redPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000343e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x343E2 21924 bytes
SHA-256: d4a001a72cdaca12ea30bd4671276c06a2feb71ec149c800c6d57aaf0070bb58
font_01_sfnt_off00037d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37D3E 11072 bytes
SHA-256: b6059be7427780abc1e90d96237a45c098d51779c1f24391ef18dc4c517f4571
font_02_sfnt_off000396a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x396A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0003aeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3AEB1 11684 bytes
SHA-256: 3d38924f8ceb4ba53e683933f2afd7787c7a836e88501b536f19a2438180348b

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