Malicious PDF — malware analysis report

Static analysis result for SHA-256 3395b4eba5ddbddf…

MALICIOUS

PDF

76.3 KB Created: 2021-09-24 18:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 915c754494454c69390f3988ffc015ca SHA-1: 99061681aae8beaaf90443c68083bba37603f38e SHA-256: 3395b4eba5ddbddf1c085b91bed5851518242be210dc02bc31520b596a7711d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host phishing content or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://crysiq.ru/uplcv?utm_term=it+chapter+1+123movies PDF link annotation
    • https://alixdemassy.fr/userfiles/file/71697621872.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/1981648393.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/wofavebigopuxirefitowo.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/dovixokazudedoseludoga.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcbd376568---61569473426.pdfIn PDF document text
    • http://falcon.dk/sites/default/files/webfm/57028287906.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/vejibarelivozugidatosovo.pdfIn PDF document text
    • https://avukat.kocgrafik.net/upload/files/tubamaxebedexuxodemusukex.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210906224632.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3e409f576---76848859647.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/36916233939.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/41609185795.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/42209165600.pdfIn PDF document text
    • http://keramann.ru/uploads/files/41181113780.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/93738531134.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e2a8c6e31---99607062883.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/i1s5vvp7hkn9u68golfnob2u27/72184657838.pdfIn PDF document text
    • https://bandloc.com/FCKeditor/file/korali.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/2056406ea85fe427c9840a4ad447f6f3/73868173691.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614482682c029---zeludugaluwar.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/jutabosezomuwukotoxatid.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/55305526056.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161492af24fa43---kuxisodofit.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/76707937912.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_off0000bd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD536 19856 bytes
SHA-256: 3a40b7bebbb937bc5f440caf6b052f2eda7ce03e1e01b6e40a827285ce02ea27
font_02_sfnt_off000108c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C6 10852 bytes
SHA-256: b3fe52f2cd000272987761d45c7a0d96ebb98d8669bfa41e788d64c4d83abb15

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