Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c85bb581b96dac…

MALICIOUS

PDF

80.0 KB Created: 2021-07-19 20:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d3ebba3e23beeb1e79c6e9a1b92df95 SHA-1: d26884cbfd115b5aa2771252facac78e40cb6b96 SHA-256: 22c85bb581b96dac6ba422d22a220bb5d99e9b7f3dfa343d6512b94561547acf
124 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous URLs pointing to potentially compromised CMS upload directories. These links are likely intended to redirect users to malicious content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4650

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/49661831825.pdf In PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/032blfusi3b7gosnuud98btlka/xobuzevopipuxokekudufobel.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f5070ea1b---libixaranofe.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/df1e2fc7b46aa9e9f465877e119fefcb/nurusapezosoto.pdfIn PDF document text
    • http://cga82.com/admin/File/fagifafineso.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/97fe1ec116d830b38aa2fbf8327d5b0d/95038559586.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/dulexesawonokiravabo.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/tmk3r8fi80kdq4i1if7hodv6s1/tuxawilakulofitofavubuzi.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4aaff960bb---gakunusizojakepivarireri.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083683c7db29---653084507.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/tezigo.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/rsgt7sn1tul7j5m076dtsl9oq3/riwabumuputefigo.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/2e8esat1eimlsg5rpet75so3rd/nowinemetile.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/9d9c173bff724c9788a08969d0d24af2/puwag.pdfIn PDF document text
    • http://ahchala.com/img/file/87905146288.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076efe29699f---somewidulawawiwepibi.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/nedalubotadevoxupisuxoxa.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/vufatupozeni.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38150c734---jufomajepamasugisaga.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/guzojowovikupukifovug.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/zuxatadaw.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941d977ff6a---38821377814.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/80690559053.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/3185209962.pdfIn PDF document text
    • http://schokobrunnen.com/idata/52729093858.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f144b966f2---zezigutuzifupodapanege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=life+cycle+phases+in+software+project+managementPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10469 11212 bytes
SHA-256: 8ab6b8a8ea5af5b7568740bc4e04c258170149950d73a8972ee540fbce12a698