Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc93db2780518c8a…

MALICIOUS

PDF

74.2 KB Created: 2021-09-24 01:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 92864951388dbd0306af09f5299dfccc SHA-1: e80a95d03d308b4d1f1d091265d795abfb7c7673 SHA-256: fc93db2780518c8af08b69d0f8d98737729a4ac52a71989a700c3a200f0e2660
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting. The presence of a 'download button' heuristic further supports the lure-based attack pattern. No scripts were extracted, but the overall structure suggests a phishing attempt to trick users into downloading a secondary payload.

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ghnservizi.com/file/5416588415.pdf In PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf9e3b95d5---66109317760.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210912191716.pdfIn PDF document text
    • http://indel.sk/userfiles/file/namixulemu.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/veramebaj.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7c485df0a---44417194160.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/90034745735.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/24421697970.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/zevexenavegowazosu.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/41500522629.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109222115357278.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/15788801196.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/piridil.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/539921c5b5a8e08f189f55f08de8d1d6/49920188337.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/pizibazukaniwutujema.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/75745218537.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/wexuxuzilarirewa.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/11332202862.pdfIn PDF document text
    • http://www.polni.si/Images/files/50597225563.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/82057900833.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/17503270094.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/labowatiledugupa.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/30584108897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=symbian+os+to+android+os+converterPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/musupixapudojiz.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_off0000bb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6E 18128 bytes
SHA-256: 7022923b44d834081d8e0b518cc2a11d09b2aa4c2dcf3e2359a6e5f5ba1a5f5b
font_01_sfnt_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 10880 bytes
SHA-256: bf898800813f4438a96a5c304ea0b3d97babe7e78151edf9bda092b9f40c84df

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