Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8424206495ca286…

MALICIOUS

PDF

99.7 KB Created: 2021-09-01 20:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1d88556d5725d7b66ef2e69216448a9d SHA-1: 815edc56aec0aec67933bb339cfc99498e856c57 SHA-256: b8424206495ca28654ef2c4f56611e171a3e2f26b592292f4ba7862b64869143
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically within the formcraft plugin's file upload directory. This suggests a link farm designed to obscure the true destination of the links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a redirector to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b36df5c3fb6---42281737121.pdf In PDF document text
    • https://evergreencans.com/userfiles/file/10186168373.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/xupezeduribidof.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/95399693051.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/971ac753c71d2cd148e03f8c1d61d772/kuwidur.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/vuzekiwirelede.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/wiwepobefovupatexomil.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/74450707381.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160985af556e69---rezegixufalisase.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e033cad3e22---61252824966.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/kavenazoxitozewitota.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/38236480797.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c1da6162941---59259201810.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/14088864110.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812cf4e1fd4---fobezotazisa.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16120f706349b9---fakipajevuduti.pdfIn PDF document text
    • http://www.moyekolodin.com/files/58393954335.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611804f2efb8f---91169317172.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/kleh65q0eeotjr6lmjcdkgjroh/25915258037.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/85878111707.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/zepawirageperugelipus.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/55837492277.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/rudidune.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/tetovakez.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/14587094147.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/dekoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+fourteenth+amendment+to+the+constitutionPDF 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_off0001219d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219D 17944 bytes
SHA-256: fa07b3a1343d97e60fa6cf64b3432892abe2522883dc21c188f64c25c5fd2591
font_01_sfnt_off00014fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000167e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167E0 10756 bytes
SHA-256: d6b1c8017de57d62889f2bc48f86539ea6187f5d84aa923d6694ff8a049f3335

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