Malicious PDF — malware analysis report

Static analysis result for SHA-256 00fb2545ee631c15…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 20:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20d9890ad517d83a09e551d8f55c1c85 SHA-1: f400bc9be800b8b3cd571cdf81cd5b4934042855 SHA-256: 00fb2545ee631c1501029c8af95aa970e73dfd575891f420e30b32b247a7bc91
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cedcba8c2---45904424942.pdf In PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/3c0494632f31490af2bcb9087f030d02/40742313961.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/42419001382.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/90858994719.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ded1792b51dd6f0cb4c711345f71ee65/27832679337.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/cee1da8027a775bde42d01ab94fbe31f/babubaso.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/79999283225.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/vegezawaliwarit.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/govumivulapunowow.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/5125825454.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/53154995333.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/vim7h8mgri3i4bbu9dk7akrmt3/rijami.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/wusimekane.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/46275918546.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/42744243152.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/45399120904.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/napik.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946a7373653---xatadimaji.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/dml44drv5s9qb1gq6i7s8rui81/69984611576.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072ed53d1058---30790818774.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/8rq7ubljsck0a032lijd4g90u5/12785842653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=standard+form+to+slope+intercept+form+notes+pdfPDF 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_off0000cf81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF81 19768 bytes
SHA-256: b61e759c8a0f99c06c812993a575a1d22f5f1ef5efa9bf8236dc4bb08185172f
font_01_sfnt_off0001021d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A34 10856 bytes
SHA-256: 23cf3f261f073798515fe2bfbd6fce92e19b1fecea895fefd161e69811a81146

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