Malicious PDF — malware analysis report

Static analysis result for SHA-256 44220da19296ae72…

MALICIOUS

PDF

77.1 KB Created: 2021-09-14 12:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cf29ac33c737002e742f83612e37a8db SHA-1: 79dde32a246910ea627c3e05431b4419a11f7c42 SHA-256: 44220da19296ae720eb2b640b0a51ca8f332b7d18668580b07f45fbcadf7cac0
204 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and multiple links to external sites, some of which are hosted on compromised WordPress installations or disposable domains. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document's content likely instructs the user to install or connect to a remote support tool, a common tactic for gaining unauthorized access. The embedded JavaScript and link farm suggest an attempt to download and execute a second-stage payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ets-sptk.ru/pic/file/58042859813.pdf In PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/2m907j07hbv7q1v3p2hn7font3/fuxifibosopesiwu.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/tefejegilajinenizewa.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/surumuweranuwo.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136822759930---26714592371.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/65949532723.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e790d355b9bf564ed258384dfd6fb3d1/87693023666.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/jewekosetuxu.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/69628230407.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ennvqf3a7otedo4nrqvtp741fl/vumogamisupixapagikezo.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/xomin.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/56022296866.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/46135002226.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138f3d1e91b8---jeletutuxolol.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/gusadamutozaxufixagoxufej.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/wajinatevisemi.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210901_192735.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/siluwo.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/16609835509.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/40007387229.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/ligebilituxipevoxajilex.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/46728413729.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161395bc7317eb---warenalobogefof.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/41690393272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=droid+vnc+serverPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000c838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04F 10124 bytes
SHA-256: 35edb705a8d414606a1a3b4035a2ad0ff278de9fc6554ab1b27969c4b474f463
font_02_sfnt_off0000f701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF701 18260 bytes
SHA-256: 4a1a728edd708548a63ec3193d9ec054142ef00f9d5a4af150caf1116c3e8bd9

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