Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d48f4ce7b2e0f92…

MALICIOUS

PDF

99.9 KB Created: 2021-09-07 14:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bfb80b2f8100896407d8ccf8b2806616 SHA-1: 6b73790e6c83b83e7a1834b1892417407b33f23c SHA-256: 2d48f4ce7b2e0f926f3876587837569385740dec80c245a02167c127cfb5624e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external URIs and link farms pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious content or further stages of infection. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/bpvpsh8m6fohqrckqu4hpm0mfm/99094219963.pdf In PDF document text
    • http://zuche0551.com/upload/file/91534693883.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136eeae3113e---lokugiw.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a273424752---pamizowu.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607581a3814a8---tamemizikixewuxos.pdfIn PDF document text
    • https://securitydm.com/slicice/file/wotefisizewejibutilox.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/84478521985.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gewagepefugejosoter.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/52533661003.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a572e70919---dabenu.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/37643817705.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/giguda.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/23004293886.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/40736700103.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/depos.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/34135370631.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b7ccae253cf9d70cdd7791a9903d6901/pifemavebu.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/fd4dadf8602cf0bfd951736e9a11937c/44086245809.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/kr41qka8f0ls6jabkvb0fvhphg/ximabodugozo.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/zuwizavofodil.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/wanolegize.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/soxiriwiwuxejewiwolegekug.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/29ba705f149161effd9406053a3ee8de/83892943671.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c10aef7b19c9fdabf5f4f9991f8a2300/73278846946.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/952ee791214910dcfce0597ed5a19d0e/teriduzabezig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=principles+of+strategic+marketing+management+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_off00011fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDC 11056 bytes
SHA-256: e0ac2be6bba80d6563844661cb1e3b2ba5d51ad74b22b6c67ed5f5a8f495f7ca
font_01_sfnt_off0001395c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395C 18568 bytes
SHA-256: 31b66ef686112039d9c125896b907019826052843703c98a32990903886525aa
font_02_sfnt_off0001694b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1694B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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