Malicious PDF — malware analysis report

Static analysis result for SHA-256 5428562e421f5660…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 15:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c2997443c2f6425460502430b808ee17 SHA-1: 7001cb71f9b5fcf23b8b5dfa33e77d0c80da6d6d SHA-256: 5428562e421f5660d44e0dd5ff4febe28fcd9757fb6c3f05ad1813496fecb607
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URI heuristics and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://catamma.ru/uplcv?utm_term=watch+der+untergang+online+free PDF link annotation
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cda558487c---72343593232.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/28666714723.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/78886574994.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/6c7e64cf3eaa65312eed30c2634addd0/92323131556.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/wibovajizabusatekuwosat.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/44229771541.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/jetebiralobu.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/gabinanejusa.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/jinolazofep.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/xidilokuduwasilekoriles.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/jobufado.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/92490957963.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/lulufuragimufuvu.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/xafezudowuvumemapum.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139fce2d9602---9986135168.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/ximimivet.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/94636063604.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/kolewexasudo.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-13/20210913182657951886.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/vapaginadipajodafuzavap.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/14198995588.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/70703114403.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/dobagetagelidulo.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/nojiduwatopasi.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_off0000dea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA2 10680 bytes
SHA-256: a17c3d0c868e362740826ff66c524f651c42f0ba34ec50d64d9873e2754bfdb9
font_01_sfnt_off0000f6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D8 19544 bytes
SHA-256: 90accc81f939019057438fdcefbd1e8f8209322748cbec4214f93a04bdc424d5
font_02_sfnt_off0001293f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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