Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42adc722ab62088…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 02:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 299a4910fe0ae2740663b4b685cf4fce SHA-1: 5bc80a35175439768039397271bef35624bd7713 SHA-256: a42adc722ab6208836c1f0bfd5164ff339681aa19a2a0851558298ce9d8bf589
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating it likely serves as a phishing or malware distribution lure. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS upload storage, increasing the risk of users being led to malicious content. The document body is unreadable, but the heuristics strongly suggest a malicious intent through its link farm structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5466

Heuristics 5

  • 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
  • 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://cottoneauto.it/userfiles/files/42727078421.pdf In PDF document text
    • https://siam-royal-view.ru/data/files/kebapiko.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/lizivegatunase.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/44233013046.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/13088487837.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/2065909818614343978904f.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/81049978451.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/kironusidufojulufix.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146753eafe7e---48671506808.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/1082681094.pdfIn PDF document text
    • https://baglab.pl/galeria/file/kitimazafis.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/60468047806.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/govet.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/68196373341.pdfIn PDF document text
    • http://c-six.it/userfiles/files/joxupumuwejosi.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/tozelafexu.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/50789252379.pdfIn PDF document text
    • https://sinarwaja.com/account/files/57126297387.pdfIn PDF document text
    • http://perfectprojects.ro/userfiles/file/jibedididizufarafunigef.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138287b9dbfa---gufokufugategisupopujomi.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210913/21091316145366336198orju3gefg5.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614007b8f3573---94068769286.pdfIn PDF document text
    • http://houselandia.ru/files/18850893038.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/zirefuxurakej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=mtk+engineering+mode+apk+imei+repairPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/9457d5a0156a6fb93388142e05badd0e/vexatererovagibabajifi.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/ramofimigu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 10604 bytes
SHA-256: c34f875afa90e5c1f28858f6fedc1a34981e21e9a90470da7e5325732032fb41
font_01_sfnt_off00010225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 18572 bytes
SHA-256: c73d336a64bc231a6e76f5b51217fdcb452787026b01a45d343e290b15c09d44