Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2623e09c8b33205…

MALICIOUS

PDF

68.4 KB Created: 2021-09-27 02:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3c09a6c145c7fd0bc362a436a381bef3 SHA-1: efdc400cd9bcabfb0aaa5e4b54baee0c77ad86c8 SHA-256: f2623e09c8b33205f76b3116a75e69ceda2b9138af15e2ab73598d26819ca1b7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. The 'PDF_IMAGE_LURE' heuristic indicates it's an image-only document designed to trick users into clicking an embedded link. Multiple heuristics point to the document containing a link farm hosted on compromised WordPress sites and disposable domains, suggesting it's used to distribute further malicious content. No scripts were extracted, but the presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136185cb902d---tesawazevavipixi.pdf In PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161417153bb77d---jusesusibovobanilu.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/wiremisizazuzitawopon.pdfIn PDF document text
    • http://eur-idea.com/userfiles/file/lonofawanizadafewab.pdfIn PDF document text
    • https://profm.hu/files/file/lizosure.pdfIn PDF document text
    • http://ketex.com/trcgp/ckfinder/userfiles/files/tanepilabu.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/49668855975.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gobobininafa.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/dexolil.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/24508074785.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144f731b9e67---kazabevazutajedopid.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/77604964407.pdfIn PDF document text
    • http://schokofontaenen.de/idata/tebisomes.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/safiwajaj.pdfIn PDF document text
    • https://www.confirmedtour.com/files/zidixakoruvunuri.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/fixopeni.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/bumuxazolamepanijo.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/13153246658.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/tapebit.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/23680118566.pdfIn PDF document text
    • http://atya.eu/files/file/65789323274.pdfIn PDF document text
    • https://hot-pol.com/images/file/78456851204.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/fd78a8ba7ee7af1f50cfdfa2a70f9814/78067481984.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/raduzoraragelutifej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sony+xperia+android+games+free+downloadPDF 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_off0000af66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF66 13940 bytes
SHA-256: f7147916ab0c71456d15096e10615a9b1e9e8550960f37d02a4693914f6345a9
font_01_sfnt_off0000d1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E5 11120 bytes
SHA-256: 263defb57cfdcc1bf13504b61dcfa360046423d2265a4ae8b8263835eab5118f

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