Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e42443b5c557b9d…

MALICIOUS

PDF

92.2 KB Created: 2021-07-18 22:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c639c3d59a1a3245c52fb93282a4d816 SHA-1: d6cc2b9afa34e46848d17c43b4ff23bbac1efdea SHA-256: 7e42443b5c557b9d26c8d1b87cbb8d1ae2510665859328a6f03dcf3100c263ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript suggests it may be used to redirect the user or execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lateonsettay-sachs.org/userfiles/file/vixarekogativ.pdf In PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/44464299676.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/seturofatomome.pdfIn PDF document text
    • https://birudongker.com/contents//files/kadorumexazapivoxu.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/xotafenijozererafimizev.pdfIn PDF document text
    • http://rld-carbon.ru/file/93879085851.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/bureleludiwukurekogira.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5f15b0d59---nozeg.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/wetekokuminatapuwed.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/224cce00bfed59025a7b2edd72ebc363/66447103031.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160708c137c8c8---darupipixuzajupof.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/mnebvee7qftp9sk57smttesl0s/45159415826.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/afe122af0b7ab9cd9e90ff52cbbf01fc/bupituzete.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/bivima.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/1474340270.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/wotobezipifilofinazajokuz.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/9ivlelo3s781c9uq1sbfg13ob6/xozapodipavukos.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/9446b9610c83c67ad1d3d29643be1cbe/daweranoborode.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/penetovetafaxoruxolob.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9470afd90---48661409587.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d31928c1c8---vumegagabeboziwuz.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/070b880be79844fee82417d4b43b793f/10041030900.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/573464312a9eb4ce6558b24287e12d60/91822766305.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/gudolufusutofavupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=great+dane+droopy+eyesPDF 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_off000106a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A3 10400 bytes
SHA-256: 76a9bd98a1cc2c765b444f8ef10e16734e5bc12f5727f86e6d5e3098b393a8f9
font_01_sfnt_off00011e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5A 17304 bytes
SHA-256: 971494538ea2a833ce542bcf33ce5b73174491bed3e3329c8127761042951150
font_02_sfnt_off00014bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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