Malicious PDF — malware analysis report

Static analysis result for SHA-256 a261057085f7ccbd…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 19:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 224fff2c44b8bb9ba2a1c49b22d0c601 SHA-1: b4f0ced9b5f01826cf2f3f75cd900afdcb3b1293 SHA-256: a261057085f7ccbd2157f4dbc2fd888a988b29b76b9e96c7df0eece56918912e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to host malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://allycatering.com/userfiles/jemekikoma.pdf In PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1610d0ef95669c---70248466681.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/85962098349.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/bamarazajonuj.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/c3996a8985c3df5687911d97159b62dd/54866430558.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/650d14e4ae6e372819d2da826f8b7e8a/jubizavax.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/59216708621.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a372b6dffaf---57168258025.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100fee0a16e9---mojujitudepareputuba.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/0677633e1add39ab31c5df0901a43bdd/zelofesofu.pdfIn PDF document text
    • http://mousike.it/img_ins/files/vorozojebojokirupavam.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/381500e7b017d475c79a6336ed8d57c9/37649940328.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/rudok.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/08/202108070406171050.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/0cbc3f18cd2ece436d77c6fe712f18fa/78798435655.pdfIn PDF document text
    • https://securitydm.net/slicice/file/84743971503.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/biwin.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/vobopufezosok.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/zevegivupo.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/ruxijipubevolalur.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a0f0c3673---suxuzutuwigozitalewulel.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/81643422273.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/20412850889.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/37519733309.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/gewinisimogig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=a+boy+and+his+dog+short+story+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_off0000daee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEE 17436 bytes
SHA-256: 7b7cf1fd3f6d14e0c0a48b4a5fa7dc29c59ef782c181c8eac2ce4f1bab5874d8
font_01_sfnt_off000107f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12007 10832 bytes
SHA-256: 3c7d71678b73eb8fb52dddfd5fb25e4f41ec0746607cc6fca6e74c9c5b432cf2