Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76455f400d49645…

MALICIOUS

PDF

89.3 KB Created: 2021-07-26 09:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 59decfab222038f85760a5b06cb8bdf9 SHA-1: 480c4af8d6cdf2e4168dbf32375de405627d23c7 SHA-256: a76455f400d496459bb73e84b03ab74245e010f750288f7542222236e966c5f1
164 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ML classifiers and ClamAV. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's used for phishing or malware distribution. The presence of invoice-related language further supports a lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate it likely exploits a vulnerability or directs the user to a malicious site to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609849beb9632---5916142821.pdf In PDF document text
    • http://say-international.eu/userfiles/file/fufobusevulixaxep.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/74408458644.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/9970799064.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6ea04130003a50336cc9b8e3ce72ab00/nujoxoxekejifanu.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f5b64bc1d35---55881128804.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/xivuroratisogibesapadaj.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608366cb2f91e---fatebolagomalufuluxakiji.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/vatativemalogexu.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210707172644152957brxvth.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe06fa2484---futuduvuwaterogero.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a08d69c5a93---43137132795.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/bec2f39f1c372c5b295d773b08e49f86/78593542436.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/69581070730.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/22811716893.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/sikigopi.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210630_0E9DCE5D39E8B4B9.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071bb623d5bd---75409871537.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3efd34c059---24094558981.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae19e67c213---batedatanexuxegiposolewil.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/96817833085.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/konipezumuwilagunarok.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49121ddd12---64205394984.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/77105317060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=malaysia+2020+tax+reliefPDF 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_off0000f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C2 17264 bytes
SHA-256: ae41aae946643b3093fcc84b9daf593e6b421a42af934a1c3166a22dca541c17
font_01_sfnt_off000125cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE2 10432 bytes
SHA-256: 3fb1358aa4c45780b8a38807d4b189558d54b29ccca38606fbf3455654bdc7de

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