Malicious PDF — malware analysis report

Static analysis result for SHA-256 7edcb92beeb75dad…

MALICIOUS

PDF

87.8 KB Created: 2021-06-29 05:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5902a5cdaaa2970d07105866774b6ba8 SHA-1: b9be00ce606584a24153ae6dc776ff78e676d826 SHA-256: 7edcb92beeb75dad73fb1f00162d4f20eb071ba068e5c6f893b574b9d2742876
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that function as a link farm, directing users to various external websites. Several of these URLs point to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://cructi.ru/uplcv?utm_term=inspiring+words+that+start+with+h PDF link annotation
    • http://logisticsnetworks.net/ckfinder/userfiles/files/85584798654.pdfIn PDF document text
    • http://imaginove.eu/data/Files/29672869951.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c201ee5ad---tutimozaposuzawutabibin.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8096279b1---giboponuvap.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6386d12824---loweli.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609845bbdda15---subol.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/bujifisajikelafutevosa.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/nr19a0p2rjhc9r7gs43ne3qkbq/tezomaxabovozitelupunexez.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/03a890n8e1n4g22rf97jgtg7mh/tozovadimirogopisufagode.pdfIn PDF document text
    • http://digifast.cz/userfiles/duxinifaratigere.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf59e74d28---39080602433.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/solonur.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/3161363995.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/5icpnepfelbiftmfqh8ipj7vj2/narewepanuxifoto.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/8163b12957994a5f18b2dc7fbca399fb/33119706999.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/73904211594.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/42800814593.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/lejoxomanuxujufojor.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/37772664201.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/6eb49b1373c15b49ce95931378afeee3/136606116.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/70995795238.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/moxegabumesapuvumidi.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e82211d0a---60587565160.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/2vglgo6tdnd3bp35ggv8qvbamo/mixupitenolazimuzewoduze.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_off0000f73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73C 10528 bytes
SHA-256: 51c43726db9010caf3c34385dd8e58a00a815faad77315b0aa423ac30cbb761b
font_01_sfnt_off00010ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF4 16584 bytes
SHA-256: eb3ed177507b32c7d3499dc0415d004116eb76e020a6509665f36f1bf1a75f06
font_02_sfnt_off000139b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1