Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36b55543c1a538d…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 14:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8f2c4872c1877198ebb944a780dacca7 SHA-1: 4d6fb08c0ccf6ae5bcecbe158a04f7b243286079 SHA-256: a36b55543c1a538ddee5924d84ed789abed921260c6a347c885c8cdbdb60520a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://synerhu.ru/uplcv?utm_term=unsent+message+on+messenger PDF link annotation
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/93045317053.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396a91941ca---juparajuvi.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/21003311206140481518bc9.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/75952546479.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/46821239214.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/retorerupopatimiwanu.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/nofomesu.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/fojudogesodagonanariso.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614271d30b529---wujewijowa.pdfIn PDF document text
    • http://cellfruits.com/ckfinder/userfiles/files/wifof.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/90902865354.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/78834153998.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/71518077251.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/238c5932ec8062160a5d73dfbc7390f5/22218024005.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/wavosagomubitib.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614830daa35dc---67729716171.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/nitemekebule.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459ee44ca2a---43642075614.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210906054427.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/zewev.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161304379c4d4a---91914863290.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/72470610328.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_off0000b165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97C 10320 bytes
SHA-256: 4a43465878fbe74f22c46f0b9d4f859261be232b29cc2c0fd52e9bb46da378c9
font_02_sfnt_off0000e0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BC 17096 bytes
SHA-256: 83910a0e879b8ec290c0f730ab7f3fd623ea2631d40c423b63248e78373f9be1

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