Malicious PDF — malware analysis report

Static analysis result for SHA-256 209000b78fbe54fa…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 01:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a0472cf2c5bcdd08b86930b43f73dbe2 SHA-1: 1d60feef41d4d5db8536c20481f068b87c84a507 SHA-256: 209000b78fbe54fa0a884537406d464054194cedcb8bbf17de64918537b02a65
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution lure. The ML classifier also strongly indicates maliciousness. No scripts were extracted, but the presence of external links and the overall detection profile point to a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=what+does+no+call+no+show+mean PDF link annotation
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16104a1eb179bf---21898894222.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b463a59354e---55992970333.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c8109a9d7---pozodirorax.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/b42b7e292043ae5cd4583f0d6e2d7f40/xudidujesubidojutuse.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/pizoresetajavuvude.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/duwumikagewegozaminamera.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/sagimegarami.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/324956893.pdfIn PDF document text
    • http://cutskytools.com/d/files/13022756291.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739510cf0ae---10284566024.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/45264251474.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/98199839757.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/94928515901.pdfIn PDF document text
    • https://hanmarklight.com/UploadFile/files/70706779782.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608870990b6bb---gatiga.pdfIn PDF document text
    • https://bjsteelvietnam.com/upload/fck/file/bikusubegeridawusu.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5233b0cd---firolakaxopinesalezu.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ffc1c87e512f7d07e58d2feb6d6c7731/nudawumuxugod.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73fbbaaa1d---didawox.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/mudalofowad.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607126af6ceff---54836013008.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/24a3f85f3d0634d566e0bb705ef24252/94040433073.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_off0000dec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC8 10520 bytes
SHA-256: bd93770bfbac9ceae0fba6a1714e5019f70bc8b2ba349802468cb87328c9b08a
font_01_sfnt_off0000f6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB2 18332 bytes
SHA-256: 0361cb3f84c6e4c59baeace51cd78ba754451f2b7b8513a40151fc310699955c

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