Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8d27cb67e15b56…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 09:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c36711d3016fa9ffeaef473e8268c829 SHA-1: a6c408383e980452feced32afc78512a05b58022 SHA-256: ff8d27cb67e15b568f5ed6cc73c922ea3a0d335162f50342a280af42970d0c3a
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. The document contains a link farm pointing to multiple domains, likely intended to host malicious content or redirect users to phishing sites. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://staractivecollection.com/resimler/site/files/kazokezef.pdf In PDF document text
    • https://digicpictures.com/downloads/lebabasega.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/bujabepisokubibenudizi.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/7a1ce9e0f7c78262fa9e7247b31485d8/51188701317.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/30410642388.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a4639ff9f0ca662242e16aee142c0d13/90125309632.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/98vi4jtn2d9ekvi45u181b4fqp/dokuvuvu.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/j5frcric88r9gqisanj37oscq1/38692395802.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/16917408807.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/7b9253bf819f48bb77096bd1bc1d206c/83757539730.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/rilizegofagapowitabodij.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/19075208290.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/80699926238.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/roxevogizatafiditetutuv.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088b8433ce63---1290665083.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/94432011296.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/44806125702.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b655fc5d441---galewikopegowupifanutar.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb77e872e76---29189055293.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/82153845773.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16074147f4c296---roxawetuzalufu.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/sajivikizenisugepazaxu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b89a730846---zumopefamowupan.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/tuxulepeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=civil+engineering+objective+type+questions+pdf+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_off0000dea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 17644 bytes
SHA-256: 32ebb54743cd84cbb2eb81e3c22540840b674efc07c3411177e02ff917d62127
font_02_sfnt_off000123e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E8 11608 bytes
SHA-256: 2ef10d2dc9040a08942b996642b8762062e7ec9b16cf2651a12cc176ba2793e7