Malicious PDF — malware analysis report

Static analysis result for SHA-256 777c335f33851a9e…

MALICIOUS

PDF

87.5 KB Created: 2021-09-04 01:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d1abbdc4f3060b089a27cb5a3c3d72d SHA-1: 087e2caad49ff5a3a3c2d409c0edf6bb1af3db05 SHA-256: 777c335f33851a9e7bd1559b833f8c37ab4b46412b7990adddf406d75c32ac52
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to external websites. Several of these links point to compromised WordPress uploads or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://crewmak.ru/uplcv?utm_term=nations+league+2018+spielplan+pdf PDF link annotation
    • http://highendschmiede.de/highendfiles/file/dugazinima.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fc45f0297---91891017112.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/tosufomijofodaputix.pdfIn PDF document text
    • https://mfdesign.hu/files/file/86233814060.pdfIn PDF document text
    • http://renknh.com/ckupload/files/xuvem.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/25573343991.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083d2e6593ec---volutexumamusebobavoda.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/lewove.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/33059608750.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bec7d3638b---juxewurodozapogi.pdfIn PDF document text
    • http://cy2hand.com/userfiles/xokopokusasolujaxo.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/86e4f9bf8e471ea5b52534e6853c5501/97069590592.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/63961994319.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a45b63c42---61209652726.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/nvn8ab97gifcltebsjuv6ubc37/mumukuxezeratejapokeweze.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/5215148440.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/daxanekatifemotaru.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/zitobe.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/lurolek.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/3f45873a6b70942e5c29bdcc199a5ba2/47596482410.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/96906930814.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/zupebeluzofoposekuj.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/20691414129.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/84148946356.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084895cccd19---fijixerama.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/setapamapekat.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_off0000edf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 18300 bytes
SHA-256: 638cc7abf8814adf24f51fb15e489821b7d8f52893ed42aff67b1c8e06f384aa
font_01_sfnt_off00011e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13633 11152 bytes
SHA-256: 4221eed221cb6b441df6fe31ac2b80af3d5f05569b46ebfcd4ea8512041710d9