Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddccd4ccde378b29…

MALICIOUS

PDF

94.9 KB Created: 2021-09-19 16:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad60bf6f5ae252566ac6fe873ad2171a SHA-1: f646e7d3b664e5bdfabad3c7a49956ad699dec5b SHA-256: ddccd4ccde378b290b3cf8e34538bcbc731b1fe101157eb2da49f390a3f198e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous PDF files hosted on various domains, some of which are associated with compromised CMS uploads. The presence of multiple external URIs and link farm indicators suggests the document's primary purpose is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • 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.
  • 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://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/rafazuwijenotufede.pdf In PDF document text
    • http://hmondo.com/userData/board/file/608971548.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/zetezaditudatagodexajofa.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/21997231289.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/mepewupotitezapopubav.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/tosovo.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/rujunagivemitadefoloz.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/rudalazubabozozekipepame.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/38476441428.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/romesesilabajiruk.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/newuzarimabimezotiwowol.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9db2ce81---wejutuvizi.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/woturoripelax.pdfIn PDF document text
    • http://maxbrio.kr/files/files/13700177628.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/bamiloro.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/26614384302.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/61879675204.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce861e23dcd984fcf7b670e5aedc3d2e/22258535667.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/fexiwedax.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/dolekefinezemasale.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/xesowab.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/pobanukenovaker.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/batibuxaviwofemilavazivud.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd6c1aba81---bijivenuzinuji.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/45757534140.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/17773395851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=hobbs+and+shaw+4k+torrentPDF 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_off00010afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFC 19316 bytes
SHA-256: 4430a44c3e88dc49ecd202c0dd0a6ed959e6036984cd666bb9b80d14d37f51a9
font_01_sfnt_off00013db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB6 10596 bytes
SHA-256: d1d1ab82eb2ecf0d9018e0334aa6aba5c988e40775e9e501400630e4562623d8
font_02_sfnt_off000155f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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