Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3b236e0b109c71…

MALICIOUS

PDF

80.1 KB Created: 2021-09-08 05:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4655d510b85d1600ee7ad9b8efba6628 SHA-1: 1e5c641b88f8380456595acade94927401196f13 SHA-256: 0f3b236e0b109c71e596a6b4b847a96c4b57e88f57615f5c9383304cc9ef68f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing attempt. The 'SE_INVOICE_LURE' heuristic further supports the phishing pretext. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://istvietnam.com/rich_editor/file/noropuz.pdf In PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/22db3055a56eeece4b8077d9e9e05f88/miwaruzewevefudurez.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/xejazezuvazizegol.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/30097379027.pdfIn PDF document text
    • http://salwex.hu/file/vanezikupinamenun.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/xeponugexokem.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/jepapofumuvasodogomakigob.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/9f1a63d9cf92830e748468bf33eaba82/kovusu.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/77966278112.pdfIn PDF document text
    • http://mitra.su/uploads/ckeditor/files/58427692099.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///55162158433.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/gemonekibufirelopiwilat.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094845bd0226---danimubetej.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c0dd7cfb78705e98bee7e68c5a3eda5a/firumufa.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/5014622452.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087f2bd7524a---65706930639.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1dab08dd2---laginevok.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/41575791117.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/43538583789.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/13008619434.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/satamuxakulufivo.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/roxiwa.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/c7dd972d27c801d35d41c99b6a588293/61013191415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=business+law+kalyani+publishers+pdfPDF 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_off0000d563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD563 10960 bytes
SHA-256: cae9cf9f430ca437596e96381f4ab30b5075135ebe0119bbbd20267fd9c6c847
font_01_sfnt_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 17076 bytes
SHA-256: 8377f603804894e1e33c1b6fae2b91251af10f5bfa6af611ca98b06afb205ada
font_02_sfnt_off00011ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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