Malicious PDF — malware analysis report

Static analysis result for SHA-256 0676a592ddda17f7…

MALICIOUS

PDF

122.1 KB Created: 2021-09-05 14:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ae88dcdb057733090d4005422431675c SHA-1: be13a63022423eae369a5029205bb31b7fba55a1 SHA-256: 0676a592ddda17f77e0d27661a7adc52b67b06c2ea797042aafdea91e438f80a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to potentially compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9892

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://pianoinprimopianofestival.com/uploads/file/79681464407.pdf In PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/d7bc95b36a5b4822d6cef045cf0b89e8/wobitafurimasifelulura.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a17d2f84---40676968810.pdfIn PDF document text
    • https://peterdegendt.be/file/33409771614.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rekeko.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/90857678052.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd393263ad---41883187736.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/29637696319.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080bedd78b97---34925486734.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/neroneketexof.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/ae269ca903fba09bfcb013a3376d86ff/1663023042.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/78b8654a6d1c18813fe4ca5bddb0ca3a/42993978471.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/wixewijegunolabijabem.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/46353108258.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bfb899850---3254923810.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/pajotenasurolux.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91856629756.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f18ef2228ab287b908b0b6c604f12c4e/todatejukovedagaxozulu.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/merapejamulajubirewuxedam.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/5a9f03c00985babb54290a87405dd92d/nironeketiravidotodigiz.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607471a39519a---bopujemiseto.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf801374de---85085657086.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/bumapobija.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/kolorajawidopawuvera.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/92338437276.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efefcae5e49---61442521853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=partition+piano+la+dispute+am%C3%A9lie+poulain+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_off00016cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CB0 10916 bytes
SHA-256: c371fc1591088a232418109e58a262e32e696b0c32da5989d57d60e6a4409b4d
font_01_sfnt_off000185a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DB4 23524 bytes
SHA-256: fb3575e9ab1c60d59d82096b41d4a34fd300f4072e066a7fffa3acb2b6ce1bcd

Open this report in the interactive analyzer, or submit your own file for analysis.