Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca1732b9c6c62a7…

MALICIOUS

PDF

88.5 KB Created: 2021-06-27 22:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc3132827b68f6c191564303cec71b48 SHA-1: 026478f6fcb8f4acfae34788e0cb111436c3c197 SHA-256: aca1732b9c6c62a766407acbdd5ebea840a79e8ffb078f7d84813a4132ba21ce
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, including WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The file's structure as a link farm suggests it's designed to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/d7f6df6322518b35b1631cf72d912a8a/xedezu.pdf
    • http://transbur.ru/admin/ckfinder/userfiles/files/vobitaf.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/7p6nnfrcr18rkkupgamh6vr7un/sopudogavavogibesomivamis.pdf
    • https://topupdana.com/contents//files/1991074188.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/f010cfc32c0d84fcd1efbb849b34e30f/kuvuwinidesifonap.pdf
    • http://cherryontop.pl/upload/fotki/file/66056883916.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608dba56ef556---watifetabo.pdf
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/309050e0f5547a758ea85bdae6c5e0ef/gonakudozogokukadijunone.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdfd604def---kopalisenawewifinavumuti.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/4c44f351ab65b259042fdd51fa3c9fe0/56444489493.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bef5ecba3---bamazoguvixefizavexoraj.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8dfeae66b---rixuwu.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160718251720de---39476523623.pdf
    • http://rgn2u.com/userfiles/files/54458971177.pdf
    • https://ahreco.com/uploads/news_file/vozolapezaratipabebukumav.pdf
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/oa0r1j4hq1f6llaii2sk7ll0oc/babidatimulefide.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/90e0d2bc11af22fdd047e262173c74af/farabub.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3939e432b---93975795714.pdf
    • https://artlabjo.com/userfiles/file/mogapusegemazenaxama.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0bbf5e472---76175691510.pdf
    • http://shqinze.net/admin/upimg/file///57836215141.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6fa3d5208---22944783520.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=good+afternoon+caption
    • 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_off0000f743.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 16792 bytes
font_01_sfnt_off00010f55.bin
4a4dc32dffe6da10500525d84d593eabd1db538fc5bf878c9daa761196bb8004
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F55 18308 bytes
font_02_sfnt_off00013d44.bin
83d87d9775cb02a88b9cde70393a99f19b7e0e4ebf8846ffcd32bc1834677384
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D44 10440 bytes