Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41448b47d20a701…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 12:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ed1503946d3f9d5c099de477e461294a SHA-1: 72aa6c9772582d66da89488ffb07e551ee1ab73e SHA-256: f41448b47d20a701ebf753ff0b628f2a1896b3185056069cc610d2315330cfe1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple distinct hosts, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves tricking users into visiting these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/hp1bmsghdt0ni1dcatgciulle1/63426453235.pdf In PDF document text
    • https://afayl.com/userfiles/file/76503154200.pdfIn PDF document text
    • https://beaszemin.com/files/jixofukegatin.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/82081608985.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/bumukugerudasumex.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duvawakoxovuse.pdfIn PDF document text
    • http://shesob.com/file/files/bamowotimamoxijidikifefa.pdfIn PDF document text
    • http://oguraclutch.cn/uploadfile/files/92695997300.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/lerefaxinipinobojo.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/sonojevazuwediwi.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/wezedorukipotu.pdfIn PDF document text
    • http://brooss.by/userfiles/file/libebogasejutawebefulure.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/leguzuvejuzejig.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16145c929691a0---nepelapop.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/68577973324.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/ha3jrd9rjgaad17hri79hbkkd3/nerozonolosunupufuwi.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/21896750210.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/bozunoselowozuraruvapun.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/46949252731.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/titibilidexupunawizuxamu.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/xudelegokufipozopataxowe.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/nuvedajufabag.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24240926226.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/belitil.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/tivonipilisubokowipub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=kelpie+cross+smithfieldPDF 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_off0000af77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF77 15940 bytes
SHA-256: a29a7c29815358f5f03f8355394ccc43969353d3a3b1513c18500cad26aed043
font_01_sfnt_off0000d7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E6 10612 bytes
SHA-256: 491517f5a192defc7ea8c2b9cdd3a21f6f1653a34f515bbee752d419cf257872
font_02_sfnt_off0000f026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1