Malicious PDF — malware analysis report

Static analysis result for SHA-256 d880113344abf9f3…

MALICIOUS

PDF

92.6 KB Created: 2021-08-13 19:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 897a39d1f4552ce77ac4a47e7ee4c4b6 SHA-1: 247f53d5abe72c2868cfc8b6b489d3c8d3c89bc2 SHA-256: d880113344abf9f32b2e2c20b49a8727e85f68ae9a357d49a83c4caeeef4d738
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It functions as a link farm, with many embedded URLs pointing to external sites, some hosted on compromised WordPress installations. The document body is heavily obfuscated and appears to be malformed, suggesting it's not intended for human readability but rather to exploit PDF parsing vulnerabilities or to obscure malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://congtyvima.com/images/Download/96989090022.pdf In PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f75404d73c---powawofibulusowa.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/vonav.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/1a5dd93dee89ac402f95104e155007b1/74690482205.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/9848301586.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/96305786464.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097e75c01317---95608392006.pdfIn PDF document text
    • http://myqself.com/upload/files/jojedoresusedepoworilu.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d55c4319448---zaxuvetog.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/natux.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f33597bd1---tafurikanarag.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a02eb3bbcd4---tikabojurudapiburusijotu.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/11926279801.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/70813258056.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/97cce71e2b5f1668c5549717b5d46a99/luvik.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/tepofejovepa.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/2plctbbmnc6se8lidnf5c3r5ke/28305774537.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a893b1b9a8e---sazodikizereratu.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7424acf1f---binipalomurorigagugan.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/sunovutin.pdfIn PDF document text
    • http://sb-78.ru/files/file/53736657206.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/43942239889.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210617200428074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=tratado+de+fisiolog%C3%ADa+m%C3%A9dica+guyton+10+edici%C3%B3n+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAD 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off00011325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11325 19380 bytes
SHA-256: c4ec472293dfc3119d0baf0b5367eb6c9d47c5307fad1fc8032fb8e9df79fb66
font_03_sfnt_off00014561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14561 11668 bytes
SHA-256: 7b16afe5ac0805758c9c41f2268c426ac1569c19653e146a8237d887f6b58d32

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