Malicious PDF — malware analysis report

Static analysis result for SHA-256 f404bf4fdbf6eadb…

MALICIOUS

PDF

75.4 KB Created: 2021-09-15 23:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d75bd65bfbaef3db5580040a96771d61 SHA-1: 3e6fd44c5ec60e1246075e0dce82cab0b6c508e1 SHA-256: f404bf4fdbf6eadb8cb49ba4dd57943884991a34a6fcff28e79818cf2311aace
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF being a link farm, directing users to compromised or disposable hosting sites. The embedded URLs, such as 'https://medvor.ru/uplcv?utm_term=shadow+fight+apk+free+download', suggest a lure for potentially unwanted software or phishing content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

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://medvor.ru/uplcv?utm_term=shadow+fight+apk+free+download PDF link annotation
    • http://dekoblickfang.de/userfiles/file/naradujatitumisinafut.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/67086028153.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/34401818104.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/21738832624.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/43532634388.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/55737620175.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614182da831f5---7353589602.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/misesutupezogowenowuba.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/a10a5a460a7020f6763d8da0c6604d45/40845889870.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/tabatuxenujan.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/sodepitilenopesejozabave.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/rokitomojirofuz.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/bozosuvebirivira.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/89976622128.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/57271881207.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/warowamew.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109140630359157.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/gigusolatabavevev.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/58383508746.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16141d933d9d21---93246447921.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/tuluzenarizitaro.pdfIn PDF document text
    • https://fultoys.com/userfiles/33758385328.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ce7dab06a1e653bef28311626c0a08b/sipadilegul.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_off0000c168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97F 10864 bytes
SHA-256: 21e1a6e64cde435545ca2673c5fcec8d54dcdfd223c2a2671c67caa6c6843a83
font_02_sfnt_off0000f267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 17532 bytes
SHA-256: 798815ddf8da6f97a81bf55bb274239cff6630deb36cc580a390cfc88ed32275

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