Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4318ad08d3bef15…

MALICIOUS

PDF

95.1 KB Created: 2021-06-29 00:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d71c738cb4637d0e17867990671fe8fa SHA-1: 21aef28b31b187c2b1846d0b2365ea350ff37b29 SHA-256: e4318ad08d3bef15048a4e6bd72a82db7b96883e6af8f2059dc96a29cd2c1055
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, likely intended to lure victims into downloading further malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The presence of multiple links on potentially compromised CMS upload directories suggests an attempt to distribute malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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
  • 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 http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fbaf74084---votasitarenusebiwuwajega.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d2d0815f0---20711838734.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/l6c56vkjrulfg7rb93jq1e1cfo/19508984499.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071c05513cf1---56511310800.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/28263c48b266e501896d2b7deba7d620/raledokuxosebutosif.pdf
    • http://huiking.cn/uploads/file/140401592185.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f93a61dffd---27150154871.pdf
    • https://chris-arnold.com/userfiles/file/tekegufugidevufeva.pdf
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/21339093996.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1878d41679---72028531170.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b876e1b479---44313290276.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607feeeec33f7---pororetawegapaxux.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/1lj60e2n51q7ctfau8d0mo22n0/topubozapukirevamawus.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd5b29dc54---60050333892.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/mli95g0vqsej1dg2h4joheeh87/jexexudenabobutarokag.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160839fa462522---vobapukubebadetin.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/55b55dbf06af62a62f2cfe64e556353c/68265191324.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d79e21b7---78425266449.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4fa431367---71489114130.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0f0840574967e71e659d5a5760b211d5/43335484411.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160864fc377152---finevodeb.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ln9ijhrjag5prnhu8amo3ln2rg/vutosoga.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/4e60ad12fe4fd374c07f6a547c19acda/fixitotekezuvukov.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=1st+2nd+3rd+wave+feminism
    • 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_off00011101.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11101 16792 bytes
font_01_sfnt_off00012913.bin
f14f863a4595fb7bcc626bc40b5aa54be7630433944739f665e5a6ad95739df2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12913 17216 bytes
font_02_sfnt_off00015669.bin
73457c6cc2e58f51ac3afc9fd799bfa298b7ccd49193d5fe330ee6c07bffd59f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15669 10748 bytes