Malicious PDF — malware analysis report

Static analysis result for SHA-256 78919fbaf70c9e14…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 16:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5d19dda85aec94ea7cb8c20a2a21cd5e SHA-1: 482cc17cd7a05d5a03d7155a2128a91ecac90de2 SHA-256: 78919fbaf70c9e14d8488f9c083ebc824f1750fb0db83a890415a638c6d4d5b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to potentially compromised WordPress upload storage and other disposable hosting sites, likely to serve a malicious payload. The presence of invoice-related language further supports a phishing or scamming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a684b9bc9---43466252640.pdf In PDF document text
    • https://paymentor.nl/uploads//file/denefaw.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/34004232191.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a6ef040ad---80032749028.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608472ee02720---naluwubolo.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba0eb0223b---dezomapulupupu.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/16138542582.pdfIn PDF document text
    • http://foodchemsino.com/d/files/84525393359.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8655e516bb---34189999661.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/8e21923303028592ab7bb3ad0d5e7054/27636245071.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/t39tcj104obl4uuduop82r9l3n/niwirurosadaperimasa.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/pdsoppiucngt7nvq14tkva849g/nudinofoponij.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160871c7472303---mupozide.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/20208410095.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/bujuxune.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/segumepubiwono.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/jemefuli.pdfIn PDF document text
    • http://epmachine.ru/d/files/2262055050.pdfIn PDF document text
    • http://klhl.com/userfiles/file/nesaz.pdfIn PDF document text
    • http://klpa.net/userData/board/file/82038388711.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/misuxogonan.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/gagufafenovurakovagepasuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=bses+online+bill+viewPDF 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_off0000dd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2A 10088 bytes
SHA-256: 704aceac56daaa132b532355acdd3e66614ae632b296be086e7250fbb653c9a5
font_01_sfnt_off0000f3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C9 17120 bytes
SHA-256: 18c9302131b14dde97c0a73f07c878c92a27e69c0942a9e7e1c9599dc5fa1b30
font_02_sfnt_off0001202f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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