Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9b6f56c4d3e1db…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 17:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: da3288f883f117d78f01dae08b94e0b6 SHA-1: 2287db06c88859b2b01f06fe1e97e67746409d29 SHA-256: da9b6f56c4d3e1dbafa4d0c1b22dc8eb79447a2d4e76bd1d8704b2e3eba88990
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of numerous URLs, many hosted on potentially compromised or low-reputation domains, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://dae-young.kr/upload/fckeditor/file/duduxowo.pdf In PDF document text
    • https://amatnieks.lv/pictures/image/sekuwesano.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/34334375735.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e3fc640299bc8831edf935b6e92e4269/fojaxik.pdfIn PDF document text
    • http://ruresept.ru/files/file/sawivux.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/koxudarug.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/2v53sltfaftl3lmr5n3b5jn9c1/32172374926.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/40291567195.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/garim.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/winapuporo.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/rozuzugarivuzazaj.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/cespquhp2564k3bkfvt5ut1rqp/wobivokepusupoligejimus.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/17848608846.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/dujufakexunedule.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/92467287995.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614068e227422---begelegifi.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/4755556568.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/82371573391.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/33219819150.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/97439029061.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614412933c007---nujobegovumijovuzivagupej.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/zotejiporevugavomuto.pdfIn PDF document text
    • https://ratoempat.com/contents/files/74856100089.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/tirezan.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/61260101937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=programmi+fotomontaggi+androidPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/puwiw.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_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 10352 bytes
SHA-256: e8c5bbe2c72152a3cce70c88b2c9c710e5a7f19148f6af41f2d71c6b05feabe8
font_01_sfnt_off0000ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001076d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076D 17284 bytes
SHA-256: 0802eafccf47e18b3f6c0ee06a5fe848b797827f261f936e380620a94d6f9bad

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