Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d995cb0c6ea45a…

MALICIOUS

PDF

87.5 KB Created: 2021-07-07 23:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: df29496ec31e2285b05fe8531743856d SHA-1: 4c342a02832e676525bec0c768937eeac19b03ac SHA-256: 12d995cb0c6ea45a67e240b69e1966ef5a38aa6d116e32f287493019415d67b1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure itself suggests a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zetotolaxalinun.pdf In PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/4a4eda852c8a510f51561a541e6eb038/79470097950.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/7029d7a9c3bad29387ecdfe8861f07f4/kubomo.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/91331627883.pdfIn PDF document text
    • http://kfbi.ru/content/file/rutuxopixenidew.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/97003683665.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/fovofobosilup.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/nobaxusuzepesisoluxuxuw.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/dakenifobiv.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5a6e41dc2---fanumateveme.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/99559895758.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc1a15d3ff---22937383762.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609424035146a---80603439450.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/zojufoxoxotimave.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160da3da562c7e---wugabatudodokatabeti.pdfIn PDF document text
    • https://brod-plovdiv.com/images/15450249407.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/22231607270.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/5cac4c0ca15777cfca008543a85aa82c/73428614692.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/kupawuzif.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608567a35575c---92952101363.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4cf72785c---newipofivexo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608f680f98c40---majovopamulebogetolobi.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c0b6bde29300f9fe37d4220c80603041/86572958049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=subjective+data+for+deficient+knowledgePDF 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_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 16532 bytes
SHA-256: c42a46630215ca068f263d551416928f12f15ba1981f88d12d97ca94c2ac5ab1
font_01_sfnt_off00011e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6A 11172 bytes
SHA-256: 059d89a5f01a9838debece3fc0fca0dce57c1ed6498655db1df4cb8995f8fad3
font_02_sfnt_off00013887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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