Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8d463ec75dea4f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 08:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 73dfd4fb6f04b60ffcc8c8b43542862a SHA-1: 9f5ab93306a3cfab3a5541858bcaf01baaeef9f5 SHA-256: 4d8d463ec75dea4fe131577c281b741ffe9e806e00c5c318944b3ce65ae9055d
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains embedded JavaScript and numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it's part of a phishing or scam campaign. The presence of a callback lure heuristic further supports the assessment that the document is designed to trick users into contacting malicious actors under the guise of support or resolving an issue.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 9

  • 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.
  • 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 http://buyyoutubelikes.com/ci/userfiles/files/44871823561.pdf In PDF document text
    • https://recapress.com/ckfinder/userfiles/files/30452956605.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/xufakof.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/42297379966.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a678964b92---58449691307.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/worivafutuwururu.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/31142716533.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/21606969297.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/sumewag.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/13288300182.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/kozumagukar.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/nojotekoji.pdfIn PDF document text
    • https://tcremich.lu/files/files/38147615103.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/bijabawasasamajikaz.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/wogiduxofukukezo.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/39228305506.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/91751178749.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/juzupojazifugufu.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138bbe35cb8c---35367354325.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed20cc3422---17423565569.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/8ordo9m76an6u35emb1hr6mmdem6ph7s/kakaninewobijom.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/wibinijenuxofuvonejazitar.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/44167708802.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/voxuxob.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/73375077479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=yowhatsapp+apk+appPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9B 17732 bytes
SHA-256: 99c493293b9d581bc29941641cc9b4183d34ca361029ae321a7668ce236583b9
font_01_sfnt_off00010c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C49 10036 bytes
SHA-256: 47acb65f1fd0f3c1b7df6eaef941fdb6b3c4173c33243d0ab595b42eec907188
font_02_sfnt_off000122d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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