Malicious PDF — malware analysis report

Static analysis result for SHA-256 718ccdb8c2a1c55a…

MALICIOUS

PDF

66.5 KB Created: 2021-09-20 21:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a47c69a7ededec6ae6549f7c3e368a9b SHA-1: 1157660835840e2d8c0ab02f382636786b3930a5 SHA-256: 718ccdb8c2a1c55a49e7b903c927642b89aa01154626070ae4cf3f57ff9326ae
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate an attempt to redirect users to potentially malicious content, possibly for further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8855

Heuristics 4

  • 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 https://archism.ru/uplcv?utm_term=french+horn+classical+music PDF link annotation
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b75088f4fd---65496193237.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///54416415547.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130321409bc3---dezomatugutagazole.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/3019330719.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/49164225991.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/xujolejizoniwa.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/93550064661.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/77704622119.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/42745977552.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/werimilotomovoxidubazo.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/21998061945.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/wutoxi.pdfIn PDF document text
    • http://indel.sk/userfiles/file/juduvojajofob.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/79734785795.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/voloxebigutaxalejojiz.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/tunojigabemunatulizaxe.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/pitaborulevoxesidajagedu.pdfIn PDF document text
    • http://one9five.com/userfiles/files/tebivirelawowita.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/3796896607.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161403ddb08616---rezisafomojakupoxajox.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/satobe.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/62230274818.pdfIn PDF document text
    • http://irinabailey.com/upload/files/wazorewamoken.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/8354115463.pdfIn PDF document text
    • http://poliinc.com/upload/files/18572525608.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329403dae60---28662836791.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_off0000c91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91A 17712 bytes
SHA-256: 2d965e38f366d46a540776b1f6839879a16de37d35a736b2ea3eb5a044e79693
font_01_sfnt_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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