Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f30d3a3d670eb1…

MALICIOUS

PDF

85.4 KB Created: 2021-06-26 19:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f527d312ebc4ea5cc906fa8874f01796 SHA-1: be784de522f3fbb2a92dc43bdc2e635406fb72ad SHA-256: 91f30d3a3d670eb1a3ca1c415749e031810c0890e5c8c12b10369f057d08ff9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/716a9cf5b75b8851e09d461197774b51/lujepejidi.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e342014ff6d30fdb9fd71513842e2743/2808233433.pdf
    • http://mkbeauty.vn/luutru/files/tituxalevitosuwerepamivud.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/9459962364984c6786ee78a3dd92b2e7/50589825843.pdf
    • http://smiletoursvietnam.com/ckfinder/userfiles/files/23577364545.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/b47908f18a7525c61c57366642849d14/71893622635.pdf
    • http://lumieretvie.com/userfiles/file/25925656569.pdf
    • http://jatyn.cn/upfiles/202106/file/1622952838.pdf
    • http://esistore.be/userfiles/file/80225386618.pdf
    • http://lab4050.com/upload/editor/file/pisipapukoduzokefuto.pdf
    • http://ilkyoukais.com/Images/Media/files/61841606915.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88c6aa49f---74220604924.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/904ce627e60947a8d2e8d2bfef0080c2/90909586997.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/19940340657.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077c7d9b84ba---toxozanik.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/jrn1m1fk8m2u5dksaq99i793nj/44544491219.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/4382b09bf61dd17a377b4b1e095cf023/54305486143.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0059a0ca0---82547336886.pdf
    • https://planet-for-events.de/userfiles/file/39743438544.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/9f30c11ba3b22e4475663d0af63f0303/19915636357.pdf
    • https://travelstore.tn/userfiles/file/55436905516.pdf
    • https://actor-conseil.com/files/file/mikisizukadapi.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/c8n2ddr8uq7cte4egq586je3om/74267610476.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/vilewejizifizi.pdf
    • http://riverbendhay.com/clients/4/4e/4e1cbd84181290ddb66fb035c9950ff6/File/mijosarawiv.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+the+past+tense+of+remember
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea2a.bin
340cc1bca5230e8aee75dec4bcde41b3443263082a35cd09e7c6c59d0c20faa2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2A 16956 bytes
font_01_sfnt_off00011622.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11622 16792 bytes
font_02_sfnt_off00012e39.bin
71d4e4d9173615b75768800f22d7e5bda24e4e9b12a617e5bfe60adc8b64ceb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E39 10712 bytes