Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c0d995d2335b4b…

MALICIOUS

PDF

87.8 KB Created: 2021-09-01 20:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4041400f4497527295c16265ce8e9bed SHA-1: 7becca6bed88be3c7a43b7e9e562182cbcd23baa SHA-256: 83c0d995d2335b4b31f7636d263a95ab4cf94eb3eda0e4da02e93528e9a6b9fd
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document's structure suggests it's designed to present a large number of links to obscure its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://nomylo.ru/uplcv?utm_term=all+cardinal+numbers PDF link annotation
    • http://uniquecharacters.com/upload/files/kiboxo.pdfIn PDF document text
    • https://rcot.org/userfiles/file/luxavabofo.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1612079534300f---93340530298.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/tenemoz.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/50865995959.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/21080102234699735864y8j1.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4f245f91986662c919d25fdaa6fe7781/sasakovaziradasiwun.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/tumujeba.pdfIn PDF document text
    • http://asvpp.fr/pdf/22065841173.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaed114c04---40871803162.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d490791ba86ad5d066ee96da6f6c5947/89343911657.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-8-24/20210824212413886375.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d6069143e9d---72270876392.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/8gqc7gk81s7kmmqq14a36i6pir/30751778390.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/zimoxomoragorovira.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/ribel.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/dikikulabiwovubavafusaz.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/o7lj9q68nok08dhrjtiqnvats9/xonipanubonadaget.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/fakujitib.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/ginezafepodixuxadixur.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160960166cf2a5---sofik.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/2baae259922b53fae697a52163892bca/tukikozoji.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16083005db0c66---sebozobitarozeramejizoder.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a99db04d54---kozupasivadefiwexudomud.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ee8fe91e3975e6e65bc1f2e7f2a61bfd/80317080649.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083da7b360d2---naxufonikeperotenuvir.pdfIn PDF document text
    • 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_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 10532 bytes
SHA-256: 3931ec9c3393f2a68a81bc649684f23279881f61f48759fe147b38f607bf47fa
font_01_sfnt_off000103cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDD 20184 bytes
SHA-256: 06f60807f356500bc134879d7af26243834f3a5900d201f703a7fcb270346426

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