Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cea11e29d45e76…

MALICIOUS

PDF

83.4 KB Created: 2021-08-19 21:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ea623a0d8b046f5b6583b6bd109d7e75 SHA-1: 7a49cb0010c50b0dd6ca8a606e1f58b003bf7dac SHA-256: 92cea11e29d45e7670c7213445fa06bea75024672c492aa6da221ff7b0fb8bf8
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://aquafilling.com/userfiles/file/5577998640.pdf In PDF document text
    • http://biotop-zamosc.pl/userfiles/file/getemumorajekex.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/48a357609c08513ec0bfcd60f2dfa9ac/jeladukejufiresekugum.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/fezarizo.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b87c5d21f3e---fufixodatabomulitigadu.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/2d384e17dd4af3fe4ae22a72aa14258a/binefapibure.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/gebuze.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71c49cb97---zenamumun.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/j6or2mp5j173ii4140ktb4t59h/zogiropemuradaresume.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68dfc730b---48026605858.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077505599e55---84291684997.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/gigurabobivorogozik.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fa7e17d53de---71318335123.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/mitubugepamuw.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/gozuzo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df675faa103---dejusata.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/15252856442.pdfIn PDF document text
    • http://irollee.com/userfiles/file/muxigulefopotaterolimod.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/novosusijimirakegak.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/zufufubajuzuvu.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/18444202031.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c4fbd2e21---3140963136.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16117af52e8077---veforowemikarof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pr+telephone+companyPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001017f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 17504 bytes
SHA-256: 12c7b7ab49f6ebdf74674a3720aa58d60ee8474bdecefb5b35ac9272e2cf50ac
font_02_sfnt_off00012f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F73 10492 bytes
SHA-256: fe7e5d15e38e413676dafe0f140de7bbd88de4d2f91f22147a094e54bee3ab36