Malicious PDF — malware analysis report

Static analysis result for SHA-256 28266c25efa826da…

MALICIOUS

PDF

96.4 KB Created: 2021-09-05 05:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b68259b00d373f943d47eabb5cf9e6c9 SHA-1: c31032faf4288cb72b850072f327b0e2c38a279f SHA-256: 28266c25efa826da6c798d02f162146aa95bfc10060a86fedef4e994e1590333
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=astigmatism+chart+pdf PDF link annotation
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16102dd2016b07---27921411781.pdfIn PDF document text
    • http://meta-min.com/files/sudifipukifi.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160858b7ecf757---50139911608.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/4473443437.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/t79mtheueiagb7n4342s7n4gue/loxizib.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608491f3d64e0---duziratapemini.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6869557931---79436493233.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/75979408539.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/fujofesapamin.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/wapibifide.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd68f71d92---befupetususo.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/mokevakebomejebakeges.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/84065622418.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f802a70917---moxux.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/3b1243d7879bad0b06d1c7defff471f3/rodiv.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/96429271273.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b9921988a89---buweziz.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/54640154469.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160738bcc31537---litumebupoga.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/llsngrl67b6hbtm95fdge1uqij/zezuw.pdfIn PDF document text
    • http://allycatering.com/userfiles/61120541409.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/xejepuzotakerufojujubob.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/goguvu.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d4a70738b9---98568659965.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60e12ff1cd0d2.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_off00011045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11045 19800 bytes
SHA-256: 19a6a64d164efbc7822771cfbd67b522a63361eba3eb50a9c46f49eb4f20f187
font_01_sfnt_off00014410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C27 10644 bytes
SHA-256: ea62c1644240d558edc0b1d58c32cfd8e2fe2436cae46c571b461f71248b1117

Open this report in the interactive analyzer, or submit your own file for analysis.