Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f75f1c23045fbb…

MALICIOUS

PDF

73.6 KB Created: 2021-09-15 20:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 91aeb8b319fdbd3f86d00a6562228f1a SHA-1: e877da563517cd51474964aad4d3997adc227fe8 SHA-256: 79f75f1c23045fbb00fc8a23277f4285143d841cecdaee62ebcffa1818edc7fa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be the exploitation of user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://sakesushimn.com/userfiles/files/karagisogokusof.pdf In PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/xakenekiwufemexegusixek.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/70933571275.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/78879801543.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/zufosaxosiminepuvix.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/30175312509.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136f179ec53d---38286252075.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/53420989494.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/zidoximudibatixuma.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/66564053251.pdfIn PDF document text
    • https://renault-service.com/userfiles/rizik.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/51792726536.pdfIn PDF document text
    • https://granitnet.hu/editor_up/xunalovupup.pdfIn PDF document text
    • http://cpviettin.com/upload/files/11662048087.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f51c6dd2adfab06d0f807ba9759ff4ed/3057215248.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/6797680755.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dc7ea68ce---10726045735.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/paniwatopo.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210903081937651.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/bokurelumopi.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/woxomurilotidukom.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/vunujixu.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/43717082174.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/62143234513.pdfIn PDF document text
    • https://senegal4d.com/contents/files/95530640541.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/tozoselolisasula.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/88354484727.pdfIn PDF document text
    • http://hiniceshine.com/upload/nologaxifasejibax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+import+text+messages+from+android+to+iphonePDF 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_off0000bb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4B 16936 bytes
SHA-256: f16d14f943ef9a6aa53cbedeef59b8f3d92e8b05b5ecd0abb56624a31e881b10
font_01_sfnt_off0000e6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A0 11076 bytes
SHA-256: a2e74e7c197c07d73864ac70a78ab50d12f8a183d9932dec1e35b326ebbfa905
font_02_sfnt_off0001001a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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