Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc19899ddea3b7e1…

MALICIOUS

PDF

76.1 KB Created: 2021-09-02 04:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d1b28fcfc41a908c35bd2300fe439608 SHA-1: 7ed80a6c213f503b8e2dd85d7d4f31fce8ed2cdc SHA-256: cc19899ddea3b7e1422e3797756ce3f4d7784d71084aba8ca3b4a0793b8b3dc7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=computer+notes+for+upsc+pdf PDF link annotation
    • http://rokakisreunion.com/clients/a/a8/a85ca1e4cfc2bb88d767af442173b437/File/54392444008.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/fatobedanu.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/molapeninerix.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/94500937128.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c931391da78---252156660.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/596tmlmd25da9u28e4ie5uf38i/xewaxekatuterixavupomok.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609afbd03666f---lovurerupetibakuj.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202108271449382247.pdfIn PDF document text
    • http://christopherdallo.com/file/97889927694.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/6b2c6cb3e2995534bea002f8131e1f61/89528963481.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743c2615cbe---59447742739.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/34129096661.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210708_89637BB83AC06105.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/12016121494.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091a4a552b40---2766044585.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f4a274b15---bomajuj.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e3bf1201a---nunutuk.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/siwibujirakesez.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/b6ea7951d707dcb992a2f72be29bb295/21171332387.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/defefatokelixi.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/b96fa6e389681bcff1224613d9306e23/58558669701.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/29274395297.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f73695ee7d---bolabidekoruvagudasu.pdfIn PDF document text
    • http://1carl.com/userfiles/file/48067428947.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_off0000c36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36D 10612 bytes
SHA-256: 1ededaf5c56c1da0b261025b69314f4d8ad1275209d59440ab5f14d8df5c2852
font_01_sfnt_off0000dbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB0 17924 bytes
SHA-256: 4fa41163451124f3f7af18e4721b535bb18e94de7ee7c47552ef06c38e2024e6
font_02_sfnt_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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