Malicious PDF — malware analysis report

Static analysis result for SHA-256 150b211864e1df6f…

MALICIOUS

PDF

85.6 KB Created: 2021-07-16 01:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cb19ab59213bc779099c07c6b9204d29 SHA-1: 6d4bf5dbfe2672ac99bc24642f82dd8e38e18761 SHA-256: 150b211864e1df6f9d33eb5175a6eaf9d98774a8a6df027b0e57595169dbd2b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malicious redirection scheme. The 'SE_INVOICE_LURE' heuristic indicates a potential attempt to trick users into clicking links related to payments or invoices. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://adian.eus/files/galeria/files/52068961782.pdf In PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-3/20210503123805143897.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/daler.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/xobunujavojawugumi.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/6732748052.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/getipobadopovufiverukak.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/dizijakolagekoxinojuva.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/89bc91f36d62a1a8e368e6b2ed40971c/33561776818.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/3512936659.pdfIn PDF document text
    • http://goref.ru/files/file/63650475844.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/lq38kgv2de6dpr8knsvl77kt96/56556141180.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9898d1beb---15824295244.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc05296bee---gamisu.pdfIn PDF document text
    • http://poiskvod.ru/images/file/92560123478.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/skmmt6gojnud05bl7dc754s4df/zofud.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac018472f75---4435413649.pdfIn PDF document text
    • https://bursac.net/userfiles/file/tulagenesalatubus.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/medugib.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608228c17d79a---68787794298.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-2/20210602230600594642.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f772a61c45a66375f69381dcf4ce1db7/25014155292.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/nuvijurozo.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094741c39a78---toxudavepotuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=software+development+policy+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_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 10952 bytes
SHA-256: 29b76e5a039fa7c06df4263255287329216b5ef2eccfa2e1415777f606986cb4
font_01_sfnt_off000102a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A7 17256 bytes
SHA-256: 6f90d736fbf715e43fb2bd9f6430563bc4da95b7bc95571951493d8dc79c03d6
font_02_sfnt_off00012f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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