Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ce70dc6cdc947a…

MALICIOUS

PDF

83.1 KB Created: 2021-08-25 09:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2d9297d841a666f10961cca894974276 SHA-1: f08d56dcde03f3a2ce93602edc8f4e9feac33d99 SHA-256: 21ce70dc6cdc947a35c6fbc614719a5328e8be483f5125ae9129ec91d4c6ebad
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 CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of a link farm is sufficient evidence of a malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lordbeaverbrook1973.com/clients/76835/File/65319415882.pdf In PDF document text
    • http://ebslang.net/_UploadFile/Images/file/59668537059.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/powupolasojez.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/lojoso.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a589d7197f---4555562919.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/9d8726f19ba63986e8450b8828ba2a35/78732288419.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a762dd4b7---kofamukiwawuxedubasoxiwod.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16079e9b7bbbed---62213746852.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a947596c78f---20663562473.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/74252003292.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/27523389957.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/709c2ebf7224245ef881f602a8a32d6a/gajavudefekijofax.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/vadim.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/0d2342a61cfa582c3157951d905d87f3/depelajabipuroxasewotap.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcd015f71d---kokumurifevojonozuriz.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/vugugojuzizoritimila.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b00dae83b---sanekagufezibugenanuwiniz.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/2960340fc018999fa68cc08ea96b952a/pavorafofutujuzerusogawil.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/75302b38eeacc0268b41fc06cf0a0df7/jowatat.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/5afaafce445fae1f6dfad5bc2f363ff8/nubegudev.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/70052735642.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/81558511830.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/l9joqv7vl7mh89rqq5hfen51k3/ligamilosuxagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=phd+thesis+in+data+mining+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_off0000e207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE207 16728 bytes
SHA-256: f84c46db50b6471715a3839605ab4cb10aabaa8681c77d9be81fbd9c001f4ee5
font_01_sfnt_off00010d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D99 10680 bytes
SHA-256: 87f607d2521ca32666f60bdbbc17268c933a7adb00e0ddc585009cc6f99455dc
font_02_sfnt_off000125aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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