Malicious PDF — malware analysis report

Static analysis result for SHA-256 cccf106cfd3f1566…

MALICIOUS

PDF

84.4 KB Created: 2021-09-07 10:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1517a255e0a172132adb53f2a06fe6ee SHA-1: 301cb24c077c52c3e15a8e8fda3986d431390be1 SHA-256: cccf106cfd3f15667dc686318e4e06f560755eadc259059d61392609348150be
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate malformed streams and a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting the PDF acts as a lure to malicious sites. The embedded URLs are likely part of a phishing or credential harvesting scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/5is2v47hlp452gsdfh5lbcv82q/11780002711.pdf In PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59092bd35---57782518269.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/4415343977.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/pifegalosireb.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/a6ae486e525451a18c2d078b95a592fa/rotonikerebinamajex.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/56710049079.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/4616b3adc5ff755f49dcc5c4ba400849/11142428621.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078940d46319---bakuwu.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/lubedevugeluxolisi.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/17346680634.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/41880547159.pdfIn PDF document text
    • http://alkanboya.com/files/file///gexevepekerujudomejawizi.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a5ec287a8---12102808763.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/pekofekuxe.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/77432144761.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210815144920_347603232.pdfIn PDF document text
    • https://maisonforville.be/documents/file/56476552488.pdfIn PDF document text
    • https://ixiu-23.com/uploads//files/202108092301245963.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/87418604222.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/mapul.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/80466099446.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/rokametuj.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce550bb6a---77256369526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=fiat+cronos+1.3+manual+2020PDF 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_off0000e487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9E 10868 bytes
SHA-256: 349316deda40b3bf883d65eeed766b4f59b8a078688897d510e8715d39349b9b
font_02_sfnt_off000115d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D8 18120 bytes
SHA-256: 13766d179a35b3903c0f888a313cd50b30330e123a46beb17f8328c75f1cce66

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