Malicious PDF — malware analysis report

Static analysis result for SHA-256 923984b37290dc2b…

MALICIOUS

PDF

84.7 KB Created: 2021-08-09 00:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ebc0967cf3fb3809b58e9aa5c8c8b6d9 SHA-1: e5c0b74f4b1273bab50054d6df1c3213eb9c2e85 SHA-256: 923984b37290dc2bc1d147075cc8c1d648fe7708ed91ed525efd0a11c1ce5d90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to host malicious content or redirect users. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b15630bc6---jefalakoxirenusifoxu.pdf In PDF document text
    • https://saatyapi.com/upload/ckfinder/files/37618800886.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/bimalopenurelezalup.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8c261913---gatenudusarexitesoselogo.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/26768815375.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d29593f534---17491052986.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/57239519346.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/1632641402.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608a542e15b71---jurupopupapaf.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/domurorisumemiv.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/tometa.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/zadem.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-7-7/20210707200638693353.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kewukawofalawivotowi.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/j2u8ot4srnk97e28lh0u73cjrr/62468841295.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085a76285859---74245829458.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/97482410730.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5b6de68cf---binurugorudamu.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/21931093930.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756d71d9e4e---bazupaxibazimofufigafi.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/170089264.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/72509649697.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/98997052110.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f5e526874---sitibadamarumeso.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/devubevodetoxuviwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=como+calcular+corrente+do+primario+de+um+transformador+trifasicoPDF 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_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 18340 bytes
SHA-256: 082ae0a883b8426dbe0f6fead30fdd935771985a42adcaa3acee6f159ee3bce5
font_01_sfnt_off000111a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A4 10912 bytes
SHA-256: 30f64663fffd6d97d5433280ddc8aed3d0d091aa0113adb70c7518d6109a9557
font_02_sfnt_off00012ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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