Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee8c0db4b6edf527…

MALICIOUS

PDF

85.1 KB Created: 2021-08-18 18:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: f82ed6953420bae3cc64718f11478e68 SHA-1: 81e3905d0ae4f7bedef8bf8385f220a3441a14f9 SHA-256: ee8c0db4b6edf5273e2e74bd53a866e8d39294363ddecd423a896d511ee1170a
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c59fcd498---34988243386.pdf In PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/73261356811.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/da57961a553dae07d354a65132003897/naxasoputij.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/tawalenud.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160718191e6269---34121819476.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/68007756888.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/buxidoxiperekodef.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/trhtotq4kecmn3j1bumohb7qmv/mazidewutubaxavokuv.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/74129583475.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/51883450975.pdfIn PDF document text
    • http://splogservice.ru/content/file/gixoxojunawodesozagenisif.pdfIn PDF document text
    • https://85097781.com/upload/files/84539808462.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161054e74030d3---15333945767.pdfIn PDF document text
    • http://medica-brno.com/files/zojiko.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/forewuvorexi.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/xifivaz.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/53500395957.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/zufof.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/69285008859.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/3455682111.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/hd534vcfutn37k63qjplqvimsk/zivep.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/xogilojujowamemezinijuzu.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ebfca9241---mifegukokideviwiwadom.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/kegexawuzasow.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70758ae662---63938513276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=unfaithful+full+movie+download+in+hindi+300mb+moviescounterPDF 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_off0000e669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE669 11432 bytes
SHA-256: 29554947db2e7abd758c50f9a77c02bddcccfecc1e504c62637d6d760f9737dc
font_01_sfnt_off00010149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10149 16832 bytes
SHA-256: fe8a59b232bf44966bf3926ce407038377343bff05732c93551d2160a46f1d76
font_02_sfnt_off00012ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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