Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfde68c78d9ae919…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 09:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 69ac929358304258787b1e737f37a4ac SHA-1: da11c556d5bdd6476e95791f2c0b94867f1b27f5 SHA-256: bfde68c78d9ae9196118a9cf61f4d41eabb604aceaadd648f7434f160653278f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body is unreadable, but the heuristic firings and URL analysis confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://laborke.ru/uplcv?utm_term=nouns+that+start+with+sh PDF link annotation
    • https://limsurempat.com/contents/files/xivefoferajawel.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/39246605291.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/kafofatifinorobujurezaro.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/43718518472.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/lofubuzigoselalulibuku.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/tijidosesapukadilipuwo.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/ec4b805feb09ae18a84716304a2d187f/sowegitigikomotidet.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/b435gft8gojab8shao9ab03qf6/nagojiluxajepapitow.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/41822951659.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/memupinapekujamopesuk.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/49257532348.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e3552394f6c489e3ac0afa368b763a4e/87187757676.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/lifedanusewolemazoga.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91788984841.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161338d804e535---53415615820.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/pomagetubufira.pdfIn PDF document text
    • http://lblussana.it/images/file/9306204975.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090917030691.pdfIn PDF document text
    • http://elskenecologie.nl/files/wadizokojaseka.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/92067987880.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/zawuzozebami.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/54844047666.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/19818623802.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/45889934670.pdfIn PDF document text
    • https://synersys.fr/contenu/file/97950434633.pdfIn PDF document text
    • 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_off0000d545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD545 17824 bytes
SHA-256: 3410edb1f6146b2bc8e5e8a9b92b9c10877c3b241ba735dc766a93a1c1ffde01
font_01_sfnt_off0001032f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 10188 bytes
SHA-256: e57cd7f82185dbbbe83f0705936a1f1083268a736c613c4ea182a8d0b5813996
font_02_sfnt_off00011a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1