Malicious PDF — malware analysis report

Static analysis result for SHA-256 77708bf126825f07…

MALICIOUS

PDF

81.9 KB Created: 2021-10-12 15:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 72e1ed62879ebece4c96e4bc198f02a1 SHA-1: cff1d0b16b5719a8a54209f4341f57fee3a21019 SHA-256: 77708bf126825f07099dd268d46f467aae73209f6a276f69783d67d12d99cbf6
156 Risk Score

Malware Insights

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

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 redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis point to a common tactic of using link farms to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://dycelife.com/userfiles/file/perijemirelulugogolevomog.pdf In PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161595ad9960d1---kopitepudoxowokexub.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/norewukupadi.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/10/202110021931031936.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/soxesugegebesajexe.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/3736881138.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/19080412242.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/duwewelubedewonabibeja.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/dotebasetakiwawujuzi.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/mojenetevejinedelisetugo.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/fc6e4546c91424b1d764741cfcb4e019/87173355461.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/99300542434.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615cf101c7a86---kafuvavuwinifar.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/wonuniwokezukor.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/71624090274.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/zikibososuwezilojujima.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/64416573371.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a22e009bd5f7a7e893fe2b18773133f4/bupigazigejagepax.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/tujidoxopazowezofapejumix.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae130337eb---8465858418.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/larituguz.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/zavoxasefelomefiluzix.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/45964747998.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a535cdfd6a6be17ca85a37d7599fa46f/92229928651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/TxADE9PCSUw/uplcv?utm_term=baby+boy+names+harry+potterPDF 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_off0000da85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA85 10684 bytes
SHA-256: 13324107992030adec6774d3f05bafe421e5379a40d01bbac87e1d42106131af
font_01_sfnt_off0000f2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B2 18572 bytes
SHA-256: 3bca9ab6a206c8e4f9cc68051f1eab2911cbd2a00a9b46eb2be1ae2a4ad3c101
font_02_sfnt_off00012271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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