Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8035b48eb366f2e…

MALICIOUS

PDF

88.0 KB Created: 2021-08-20 15:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d618fa587aefe7b98d5786a7fe7e3b0f SHA-1: 5c1f6895f3d50e812556e9f6cb1b0cac5e228c0a SHA-256: a8035b48eb366f2e6218af66fbb01669b69dc955523bcb0e01f2c57055b9e531
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://umartravel.com/files/wifejadojodas.pdf In PDF document text
    • http://cluboutletmoto.net/campannas/file/fowupidar.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/funirusilupi.pdfIn PDF document text
    • https://angkalaris.com/contents//files/xorelabozix.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/29a44758022b059312ccce34b086cab2/61014949270.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/bonixuxukuxagepelokoliv.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/rewusuwijevuvobipusukoko.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/zutokipib.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/7743352397.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/89321324209.pdfIn PDF document text
    • http://stevis.cz/files/file/medujekazasifimuvamutaz.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/31685142251.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/63868112043.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/73784577554.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4081b5f05d---rameroramotobele.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/fudogalawisuwikiwaravifi.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/faxuwilabifel.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec8cfde5a9---33995618281.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/7521116552.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/mafomer.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/10718515512.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088005089338---sitemijokukenidezifakuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=10+ejemplos+de+argumentos+validos+e+invalidosPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/15058065652b9ea962e0745dee4a9400/47911583142.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_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 18752 bytes
SHA-256: ea1e38d524df34155f7e5661c8d0f54e227a555476bc67a26b4ecca9fb5c8375
font_01_sfnt_off00011e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E61 11108 bytes
SHA-256: 4fc9a7ebd20b9a4510932a71d5a4ac1e00bc2f5877a4bb7299c03001814076c8
font_02_sfnt_off0001380c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1