Malicious PDF — malware analysis report

Static analysis result for SHA-256 e98c9fd4d69675e5…

MALICIOUS

PDF

79.5 KB Created: 2021-07-27 10:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b3d4732dac5636d77d911c2eb66019ad SHA-1: 69ba10383ac539eaf78cb326b9acd6875153fe25 SHA-256: e98c9fd4d69675e566d6283e72068d29b9b890e3e9b45f882e4a1b47eadbf53d
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous URLs pointing to disposable or potentially compromised domains, suggesting an attempt to lure users to phishing sites or download further malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://maryamghiasi.com/images/upload/files/ramojaruximelun.pdf In PDF document text
    • http://jullien38.com/ressource/site-image/files/98632125242.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606cd3b96e5d7---91337672980.pdfIn PDF document text
    • https://t2sc.me/userfiles/gofolizepige.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210504135220_1634607065.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/66447133562.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/8f1b2802bd970fd33605a05413aafa60/guwuzidegimomexi.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8908881f1---rufuka.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/50381280067.pdfIn PDF document text
    • https://totounited.com/contents//files/38664909451.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/kigifarufipefibaxu.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/42929004735.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/bifalisibudem.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db4eaea2975---xefapomokunubitakoxiger.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/20872008702.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0a9615d1bdc88657378220fd678406eb/37066140794.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/keselivasaxigixojodut.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e4b53f67d---dobuwiwoxomerovaxomima.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c906cc8a741c3c1cb01b3992545aa18d/fapiwoji.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/39750983075.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/31995899291.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f30cc168242d5f77a7f3cb7cfc26422f/53903903247.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16096c60504f11---kujatijixixa.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccbdd2e5b0---82704415559.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/dosegibafizilaser.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/38c088348a0a3944cec8b4fb57c54acd/63906390318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=exploring+art+a+global+thematic+approach+5th+edition+pdfPDF 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_off0000d045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD045 17336 bytes
SHA-256: 585fe3eac163fddcb9815448cd05a23144f513282e1ec49cfab48a97a340aa01
font_01_sfnt_off0000fd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11598 11256 bytes
SHA-256: 246607d4d9ddbbdc536736a64bb43ce5e03d8cc359a2b91e01a1e827298c839b