Malicious PDF — malware analysis report

Static analysis result for SHA-256 035639b23cb699c1…

MALICIOUS

PDF

76.4 KB Created: 2021-09-05 13:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4a350d5dd2b4823c0a44b89177a5d996 SHA-1: ca84e10778b1c211bf9348545e09794dac959319 SHA-256: 035639b23cb699c15877f6f9836ba5eeb99119fcb8638f63506c269a1f78915e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the classification of this file as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917fd15e594---fazefubadokanidadagufone.pdf In PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab627f626e4---pamim.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/majoseziko.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b46108e40---55633879203.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a32c605f175---jimivaliramunabokabidi.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/42243713738.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/riwolavasajewuza.pdfIn PDF document text
    • http://boursemoi.com/userfiles/file/zafiru.pdfIn PDF document text
    • http://falerisztika.hu/tmp/dejetiludonojeko.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab429d0260---tadazupikeroliguzal.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/de912e3f782c5ac401f4f776e98337af/64956950439.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6392b9cbc---kewajori.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1bbfae06fd3ee718b77e24b61d1099fc/kalib.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/60887374072.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/efd2e5d19ab078c0e516b363324ec4d5/17522922459.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/696276240a440d6dcefeb04f42b28a76/28201736494.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/52310821287.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gafawu.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/6473dcafac93e96ae76cfe8f770b165d/19274033084.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/25494879571.pdfIn PDF document text
    • https://powerseas.net/userfiles/file/mefotu.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/girekemoxubegizorosofa.pdfIn PDF document text
    • http://nessium.net/userfiles/file/53838537371.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/93890664560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=piano+notes+for+bhojpuri+songs+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_off0000c6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 16876 bytes
SHA-256: ddc552bdd67c2e139e8ba299cdf4ef9d2f14c8f589b29077e8ba5810607cba9b
font_02_sfnt_off00010aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA0 11100 bytes
SHA-256: 28c9297b19e5ba38edb31e9bafd8bed9278e3e01cb8f57e46d02d324a0140182