Malicious PDF — malware analysis report

Static analysis result for SHA-256 639c760468fd2113…

MALICIOUS

PDF

58.2 KB Created: 2021-09-04 13:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 08fb7c8c8a35b702b1e06ef1774abd68 SHA-1: b89eaf10ff04ab708193914d45b54d2f869fc756 SHA-256: 639c760468fd2113240a3131e476d09b2aef8bce8d758b37386e7278e8033c1a
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload storage and disposable hosting. These links likely lead to the download of further malicious content, indicating a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8383

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://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160f73f7b9d6a6---83506279846.pdf In PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c90b924b0e5dc98fc797dab8aba90334/kijezozapopunosagirixupuj.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/2139d42b47ddc5dc60206d3daea0491d/gojunobunojutupubox.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094939e2598a---97241954244.pdfIn PDF document text
    • http://www.centralperdana.com/file/48450125262.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/f9806e101da321cdcca6133aabd8452f/7289985197.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/78430033767.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/75700193847.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/54309456604.pdfIn PDF document text
    • http://unsersohn.ch/images/file/liwevak.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60FB844F7B392.pdfIn PDF document text
    • http://bronia.org/userfiles/file/bogedepasevulol.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f0b891cc8---nosafojukigenaleg.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e6ede3e37---16669906178.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b431c1827f5---30135218747.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/3045096231.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611a466ede1a1---52335263391.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ebkp4o80gqh204r19m9tdmp2r6/31639832630.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/47043722656.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad6c17df3---tuxuzumuxisojozirag.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/vhmu4knredgiejfhg5h569fa8i/rufubedenali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=fluids+and+hyperosmolar+agents+in+neurocritical+care+an+update+pdfPDF 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_off0000d40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40D 11256 bytes
SHA-256: 018955927e9d4ef31cf934bc5ddee432d5032174b8c7d118b739b412b11809eb

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