Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccdf2a4943ad6d66…

MALICIOUS

PDF

83.2 KB Created: 2021-07-03 23:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6bd640e5b431e8ec99f7f22b02ef5300 SHA-1: 21404f7785b6a1f2bc277bd5755862da07a620bf SHA-256: ccdf2a4943ad6d6620ee96a533af6a3a3f1e1427f1590faa7279c86c5b1feb7c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. These sites likely host phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://kimbuunguyen.com/uploads/userfiles/file/24167065072.pdf In PDF document text
    • http://praxis-greve-polley.de/web/editor/files/sowozatabibezexi.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609612bc84d09---vepiziburofuw.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/48497438513.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b1242702f---38097399700.pdfIn PDF document text
    • http://ellerbeefamilyreunion.com/clients/874543/File/41841329997.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210608_182502_4429.pdfIn PDF document text
    • https://dm288.rs/slicice/file/59485449467.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/45945077842.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891bb5e3013---20167816299.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/gaxawid.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95acbc1c79---mimananagutu.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29cf562e3a---wedizidugupewe.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c19472e4c74---40798404799.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/221c144d355eea885dd5e1c0cc8a933a/83112387846.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/iferjs2v173ppuu759mprrmh81/jexor.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/47320270377.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/bezewat.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/295037de8f0b3c216a9dd93e949081ea/zijodu.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b4033381c69---24516540777.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/wofaripamugevifevixu.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/40446984021.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/zaritodepetologuwama.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83580658623.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/jijunelefufaded.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/56420315174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=sequencing+events+worksheets+for+grade+5PDF 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_off0000e1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 11408 bytes
SHA-256: 84cce46c7800fdbc3bfbeec43ec0bcaa0502bbdedabdaffc803f285dda260151
font_01_sfnt_off0000fc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11481 16492 bytes
SHA-256: e80d9fd96e779c6191dea0de4b5019f1f3b2a504077551cca5a9a4bdd2bd4675

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