Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be44be70d2e506b…

MALICIOUS

PDF

71.2 KB Created: 2021-09-07 21:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 79ac511e92292a7ec9ac1e27c38829d6 SHA-1: 06352d2616bd2253b4670dd830ef65ce1e240fc9 SHA-256: 8be44be70d2e506b6bd037f35e5848ec376dd7661aca6bd36982d214376469c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on potentially untrusted domains, further supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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 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://ketchas.ru/uplcv?utm_term=humanizing+pedagogy+pdf PDF link annotation
    • https://my-natural-style.net/upload/files/64184588089.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160954aa9b1584---75690103234.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/diguzelometitov.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/83445485960abf0c201d62.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d395bfb2c59---15574363996.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/8edcdc8022eaf4928434c1be279d0501/punokivubirefeno.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f141ee6d288---rijak.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae60bda865c---40375954957.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/53964863109.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609072e282d69---dulitulogol.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/5706793665.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/67101771154.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/13879870178.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/wamaduji.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/p56mitmefs0l52lulpp62hdf4l/zenarad.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/nedupegonadojem.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c19be508d47---60352174045.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1627181862_c9be752079.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/purasiromegafipebupis.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/77339mt63ae9bqlu9d8v1h7vvm/zogavasuxuzisilir.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/ad18a47ee768402cb600678caa1fde1f/44211688765.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/linaja.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/ababc3a4daf034883c896583881c58a9/xewovifebiwojupozij.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/96111306246.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_off0000b70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF20 15808 bytes
SHA-256: 93ffb47ba53eb68b8fdb328b4b5f218368e90696b610a502f7c3eaf8a45a13fe
font_02_sfnt_off0000f763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF763 10696 bytes
SHA-256: 8c3bb48c4c6808ffd923499cd986e111c0d9764cc3ebb9f963683c81a5e8a5dc