Malicious PDF — malware analysis report

Static analysis result for SHA-256 c865d7b8cbe6e8ae…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 07:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d1ab74f1ff51e6dc8331ddfde7d841d8 SHA-1: df3c91d812c6201dbe73e0c5263a074754e439d4 SHA-256: c865d7b8cbe6e8ae0525b0f2e9c8b98f875198f59863690a5cd4c2761eb9465d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://munis-roquesalbes.cat/demo/vilalba/imatges/file/27272598942.pdf In PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/wosuta.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/lifarojodopumu.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354b763f870---vivexufudifatoxiw.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/vabatuzawenu.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/jafitujuxisuxukok.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/tubovomutav.pdfIn PDF document text
    • http://test-immo.com/file/ridipesimij.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/rhvuu1m3i21tkeqa5rs6d9f3ms/jawuretexaz.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614013135bd31---66650858554.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/xageniveporibawoxovexox.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/18878952333.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109032326475822.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/7185719108.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/57925571778.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/rijenirapaj.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/debojimitarotigolomegam.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/gopafomisukebowuxarudumer.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f10c9c3145---povekajonuwodamu.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/fdff07.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/gabetetepakijuni.pdfIn PDF document text
    • http://kaies.net/upfiles/210907005719028091peps9x.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/90204298065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=resistance+retribution+psp+isoPDF 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_off0000d659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD659 19988 bytes
SHA-256: 2a5b7f7f23f1774c837f0030ef0d61e88a57199c2248ff8e37d5ea3259edd55b
font_01_sfnt_off000109cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E4 10604 bytes
SHA-256: a36efcb22b3ec161c59f3863b4fbb4bbb7234c087019b387565598dba824c22a