Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f9f92d923fb2b8…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 22:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d3e4fe7632d84f9db2942f80aede3616 SHA-1: 6007bdfc302d17d9a10442bc7c777e666b364338 SHA-256: 28f9f92d923fb2b84adeee08b48b91bb6b7b49a38611c697c58c40cdf56a71b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs that function as a link farm, directing users to various external websites. Several heuristics indicate this is a link farm on disposable hosting, with one URL pointing to a compromised WordPress upload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://laborke.ru/uplcv?utm_term=bloons+tower+defense+html5 PDF link annotation
    • http://timnhanhonline.com/upload/files/67194198370.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/43250710825.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/giboruwiweje.pdfIn PDF document text
    • http://nemochem.cn/upload/files/52193225446.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/41519225424.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/80566811392.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/60441994808.pdfIn PDF document text
    • http://gysanya.com/upload/file/210913130635620498xc3ama6ir73d.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/780827358.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/30276384838.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/gikevesumexuti.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/dukorojiboriloduzirulator.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/3188291520.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139696b9823c---tewoniwuzamobaxewumed.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/janifuzuger.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16144eda2991ca---67648943598.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/pujoromu.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/pelexugefusedawuromuxif.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/kaliv.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/79294471959.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/21f916cde73633d386b042d3a73db54d/wibivalefezebikeginud.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/34151231750.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/2664247947.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/757e3c57ddb70ea93e545caa6d72757a/tujegokugubajedagemomoji.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3a50a15c1---99241273012.pdfIn PDF document text
    • https://rais.bg/uploads/file/dadifolitigumaj.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_off0000d065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE877 17976 bytes
SHA-256: 7b0beb3f57c10a30b093a86ec829f5603156ba6eb68ba256264a421da75a42e6
font_02_sfnt_off0001163f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163F 10640 bytes
SHA-256: 4ee70f66012e73f893427a375137869a845e7fc2143dfe6aefafec0f3b8a5602

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