Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b459ff0311ec50…

MALICIOUS

PDF

76.4 KB Created: 2021-09-28 02:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a00b4099c738858458c8fe35296bd9c8 SHA-1: fe6b1ce584c0ef4685c8f2e04348aca3723947aa SHA-256: c8b459ff0311ec502a3d404ebd659a14f39f535b81319d07989d5e9955db80ff
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable or compromised domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the conclusion that this document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • 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.
  • 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://garglob.ru/uplcv?utm_term=mozart+famous+pieces+piano PDF link annotation
    • http://geoman.cz/data/file/41382562712.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/41088892136.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614efa5e5df09---54597100248.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/48152660862.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/dedusofususixozux.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/89756672876.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16149a11217330---3788206860.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/43092575218.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/masoxaw.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/86956794923.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/buzotobufu.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d78d8d9411---kupafiradirakenufatit.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-14/20210914183123171397.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fc1b61f17---minawudated.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/kojakup.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/vogekuximolu.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/46702717962.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/14147902883.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615237b30d30e---bokatogemomujomivud.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210909064448.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430d5c329a6---96891256462.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/fekero.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/98051714179.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/lenegadaribavinale.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/pomasesajotomewubaruwu.pdfIn PDF document text
    • http://dmkert.hu/files/file/fakixopusidala.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/88602697332.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_off0000c271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC271 10748 bytes
SHA-256: e9f6f8940359b0c89b80555f191118807d03815a165fd8ba1d1e418a28e451da
font_01_sfnt_off0000db3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 18852 bytes
SHA-256: c35a6b8d1eb80da1124ee2bf199db975dee24d2c348eef7f89cf492b3f75f518

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