Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e1668956ac16b2…

MALICIOUS

PDF

80.1 KB Created: 2021-06-27 09:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ec8981e30203641ebd9c9902b262f21b SHA-1: e38a3298979f7691a31697bd398b4306f2947956 SHA-256: c1e1668956ac16b2f7c8c5bc3c2ec495e6b41f608ea6b1e9462350a9e1754ab1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm, coupled with the compromised hosting, points towards an attempt to lure users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/67497823860b6ff15061e1.pdf In PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/92c5723bb8624c29dd8170a0492cf180/fukivufezonawelujerotik.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886016cc8bd---lumunenilubuledawupilopos.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/xudap.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/9737314f17e4879167b79b0d05d3be0b/47797122641.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/aa033ca7522d2495ff771d6ef9bd559d/1233679562.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/diwefinofazivelagomisoj.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34cd189d4---26153463937.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608624b988ddf---6467235132.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/aee5d309c350dc0f561b47758749c66d/2563113024.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/rukabugig.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/53282726180.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210616_D27BDD3118BA2365.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/47268367904.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/4a96135f0e267506c7140b6b6870da2c/19897792807.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/62466549759e31c4dd380d71f1dc1020/94427242951.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/dd05699e10ef86cee753590f7311958b/nexuvudatiniwuwazorenut.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/rafavatulefezi.pdfIn PDF document text
    • http://bjjiffy.com/upload/lajoxuweguburus.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/c302fclic64vp10rnqegts7u10/2393480777.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/tezoxelonured.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/i6felbdtnktjsfdbptfhqgtbh2/sitoneturinegogojel.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/sidig.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/17011701084.pdfIn PDF document text
    • http://infunplastic.com/d/files/65368618072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=where+is+704+area+code+fromPDF 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_off0000d10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10B 18880 bytes
SHA-256: a4195e13cb876218d36d22d2f158df5da8aa6d51920d4e24684216efefaf5ea0
font_01_sfnt_off00010096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10096 10736 bytes
SHA-256: 2a3efa72d92de68aee984f79478083bdea0edf3c54987fa89000ce4e646a01fc
font_02_sfnt_off00011968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1