Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8b02cb9a012077…

MALICIOUS

PDF

89.1 KB Created: 2021-09-21 23:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6532bb2e52ae9793647df4ffd3a143d7 SHA-1: 4ca6fe578c01a653571691b2e88c14564bd9c108 SHA-256: fd8b02cb9a012077c223fab6aaa1637c177a72a90b8660bc882487d98f88309e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://archism.ru/uplcv?utm_term=spam+text+app+android
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb4aea4e23---tefolimude.pdf
    • https://euinsuti.ro/app/webroot/files/userfiles/files/dulaxezibavogut.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133f3e834f56---67916964201.pdf
    • http://vncdata.net/app/webroot/uploads/files/42408198470.pdf
    • http://anoh.net/pds/userfiles/files/dezuziganamipaguxe.pdf
    • http://pamatudarbai.lt/ckfinder/userfiles/files/91297370760.pdf
    • http://adabaskimerkezi.com/upload/file/fadifulijezazekojaxo.pdf
    • http://sjzhtchem.com/upload/files/zosunemomoxizudowumepes.pdf
    • https://matratva.in/userfiles/file/75515758765.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/d0f01d0f2e75d93e2d5ee5b739571aff/69617323544.pdf
    • https://wsbtitan.com/images/file/fujaletulifomejodanale.pdf
    • https://soudurelausiere.com/upload/editor/file/6312434041.pdf
    • http://dr-onesrl.com/userfiles/files/gibevuwij.pdf
    • https://ultralloy.net/upload/files/rerezojexilafibaru.pdf
    • https://maturana.cl/upload/file/gibatowimux.pdf
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/45403647821.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d23b8ade5---5306050403.pdf
    • http://sayarbobinaj.com/file/99271121379.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161414aebd5ac0---sakakevuvowogojiwipe.pdf
    • http://firesecurity.sk/userfiles/file/86387318052.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/egvh25ivv6aithtu4u61t1uup4/xirunusobufudo.pdf
    • http://yuc-fac.com/uploadfiles/20210910224447.pdf
    • http://fruhmann-elektrotechnik.at/vuvawamovesigamis.pdf
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/85998988894.pdf
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/jeduxopasanigukeran.pdf
    • https://makanbanyak.net/contents/files/zokifefavunogowobapomefe.pdf
    • http://chiengthai.com/file_media/file_image/file/vupemesigo.pdf
    • 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_off0000f8f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F5 16792 bytes
font_01_sfnt_off00011107.bin
0450062c97d6be8d39bb1b792634591e5e9a37bc2e99d23670d1bf908eb565da
pdf-font-stream PDF embedded font (sfnt) at offset 0x11107 17652 bytes
font_02_sfnt_off00013e89.bin
b9454b12c650603f757887f2a5e78260f7f870bad57d5a7d14c7cdaeb3fb95de
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E89 10516 bytes