Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb0bda0fa96435a…

MALICIOUS

PDF

74.0 KB Created: 2021-09-10 00:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9a063e5e19760c3e5774bc8340c1ae4b SHA-1: 8c6689c4f52d6da4feb92ce60733df8a08ade361 SHA-256: adb0bda0fa96435a6a53aed5e4793e820a444c8039e4fae99dfc0c74c01760ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ultrabeauty-ff.ru/userfiles/file/ruxituju.pdf In PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/92423604989.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/95840166700.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210906030257_638255948.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/monojerawimex.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/c8d035692cf83e88c7ea2143b5d04faf/rebemugur.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/vupufebuba.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/razogal.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/jokaki.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/33547337477.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/20287567916.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c698ec7e0---49182050422.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/tuluxujex.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/8430348692.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/18828428936.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090407141888.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/dff0b56a794c746b8d311bdb26db32b3/miboki.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16139e3abe58d7---nawona.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/16133290999.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/36450534357.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/povimajano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=douchebag+life+2+hackedPDF 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_off0000bdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C9 17304 bytes
SHA-256: c35f4e75ad356ad2c266a8c67ecf7ba594ea5013e30ef94b1df76acbb71a9469
font_02_sfnt_off000101fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 10736 bytes
SHA-256: 712397d27f584555e3b67fd4a12b4b5f69bd2f0879fd4502905876bfeb22395e