Malicious PDF — malware analysis report

Static analysis result for SHA-256 31757445306d17bb…

MALICIOUS

PDF

75.3 KB Created: 2021-07-02 18:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d8ba21a3548b32dee8ce750d4ebd9fbd SHA-1: 7e6e072ec814824bb0bc1cc8143729619ad12428 SHA-256: 31757445306d17bb79480003f21618206c3dfd2ee6fd2b685c5aafcfafb02d5d
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://crewmak.ru/uplcv?utm_term=one+step+equations+integers+worksheet PDF link annotation
    • http://otczenacts.com/media/files/zosufudarimivojuwa.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/eee888c11305453ae7697533fbf3b70c/9447105676.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc6ab04b37---68719607870.pdfIn PDF document text
    • http://bronia.org/userfiles/file/fuzutaw.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/nirogupefavi.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/acgbkbt56aemlulnje7hsa4cis/14265835337.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/83683309127.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/tanuximuwoxugel.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b8911f358---pofuxekitupuraza.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607100a3c5e4c---21263646109.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/drcicbda4j8rg2ceu935abj59c/33181745698.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/timon.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202106242016456181.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/9903de64d00bdb98b8f296e60902ca33/91888692607.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/18851732074.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/882181638.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16079089d54f63---17798486007.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/fufikikarejagijubax.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/nanolikenijidezegita.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5554dab824---kakozufajapugumivobe.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2cf734712ea4c8d3976a31ffe6197949/36087399857.pdfIn PDF document text
    • https://x-software.cz/data/file/bawemefajedojuja.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/3a901a8683dd1e1e9a34ac40b96262ae/gitatiwawurevow.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_off0000c35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 10936 bytes
SHA-256: d5381e437e74be6a5d4e12eaad3261a3924b1fb22f3d17d8628482bb01b2a114
font_02_sfnt_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 16764 bytes
SHA-256: e5fe682dcc15705f67ca2e8b8682984beeb10b6aba9cebd3a3519acd0522fcb7

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