Malicious PDF — malware analysis report

Static analysis result for SHA-256 444662fbbef4397a…

MALICIOUS

PDF

99.5 KB Created: 2021-08-11 10:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5de54c922e77e1208bef006839e55e81 SHA-1: a69b8538976deae5f6fe8e478fd55db05571050e SHA-256: 444662fbbef4397a0ac17e501a8c3e932c03b83adc327c254e32cb797b988be0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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 https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160757cfb6993f---dijuxime.pdf In PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/pilawa.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/44605365777.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/7ucc1n8i7r93cemc2h56acfcn2/96842185323.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083361a29563---gumixulujovuwobebuzo.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021061205481656.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c874cace42---mesaxagumutilamine.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/wuluxifuzigepusekaf.pdfIn PDF document text
    • http://w-mill.jp/images/file/76466740715.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/ganoxaremifomipes.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c41f92d8b40---8038247946.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d0087ce931a---41610381865.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ji9j3k49conoiuq8f7811dgef3/mizevudadulitufaxuva.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/kurujumer.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/90882378745.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/lorekuviwiteloxaniran.pdfIn PDF document text
    • https://citytrafik.nu/images/file/70308822897.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/xifixuletogafifokojem.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ec83a45bb---71900408970.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/15d1d947d9fde2045dfe30e686b53383/tuladetuburimiwetisoji.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/bevitebabinofe.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/komunosifi.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/diretabaza.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210808040657_d3V6ZXN1Z29yaXo=.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/df83b3354088296f89ff0b5fb4072eb7/zoleduxigorasazitowijigo.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/983936f806ce48a466a29b99dd89281a/16929883929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=nice+guys+always+finish+last+lyrics+1+hourPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off000154f3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x154F3 23208 bytes
SHA-256: 3c39a61b871458211abed7e74a163ff43d1c5032aa6b7e36a3c33936cfc16dc6
font_00_sfnt_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 21152 bytes
SHA-256: 5d5a7550ca03681b709c4a97875142a9de43d659a4286edaf1f018cfad989da8
font_01_sfnt_off0001236c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B83 10944 bytes
SHA-256: 592d24ace2828b746e913bd597bd067c34ca38a8cb7c4607c69c33daa2d856c8

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