Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8dd665a1b2e7ae9…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 08:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bc168e311c716ab315a8931c0b8b69b1 SHA-1: 5e93d8e47640d045e4d0963fca82314e5f45b309 SHA-256: d8dd665a1b2e7ae95925842cc9c27ac15827fea5e7cc64fd103cddd4252326b3
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests an attempt to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdfa5cb55c---riras.pdf In PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/345a3246ace30742e8d05e5deed8181b/bolikunazodakufubi.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/nafegi.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210830_3E2729B005C8494C.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/dewisuvofimugijer.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16089e529b1648---bonenivajetajej.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/samugaduxalikezilutoze.pdfIn PDF document text
    • http://uco-kampen.com/media/files/milimerikevonor.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/3f3bc186c473fb6bfbec413e483d95a0/48221285517.pdfIn PDF document text
    • http://d4sontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/xutovipodazuxemojemi.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2a3be65be---futowemuwajunewud.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/15449112008.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/82314089862.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/43830924418.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092254b666d1---tubafof.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/xajododemerebatevok.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/nisad.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/sonesekebi.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/44511744006.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lajavanosirebabukelaj.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/pulogigorat.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/dotivizelilugij.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/sokukevevawefisok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sociology+questionnaire+examplesPDF 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_off0000da45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA45 11256 bytes
SHA-256: d321301efb9555b8128eb480514820f0cb2e290e1cb640ce55bb9d219281bc9d
font_01_sfnt_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 17136 bytes
SHA-256: ab94d97538ceeef7f8749339c99e05b0d1258971b3c7ea7ed4af60578bed0ee2
font_02_sfnt_off000120be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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