Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf69a24dd6b25c4b…

MALICIOUS

PDF

74.4 KB Created: 2021-09-10 12:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a71509d4e680298065c8dc74d54d974 SHA-1: 2e294041b738481f97d87fa2af476bc830ba7b2a SHA-256: cf69a24dd6b25c4b5252d970a22d1cef1e883b5e36212ff74ce4ed34593802fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to unknown PDF files hosted on compromised websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, but the structure suggests it's designed to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/p7laulumhtjmv64ipvs0v22u90/rinoxunakores.pdf In PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/20566889976.pdfIn PDF document text
    • https://olterus.com/contents/files/906731555.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/mufetiwal.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/dozowefegitamiz.pdfIn PDF document text
    • https://citytrafik.nu/images/file/jejiwavufelavejixeji.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/derilidosuju.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/85537417459.pdfIn PDF document text
    • http://shopabrang.com/images/files/luweburukatezafol.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210902_19170119C52DADD0.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/25386119383.pdfIn PDF document text
    • https://onecre.com/images/content/files/gewiwosuzoripizusazed.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c14ed00b---vukopaseminiwovilabojiko.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/27f330acf683b577461782227b18c58c/vexozefolo.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/efjuhv6an42ifbbccf5ceagth7/75841051180.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/pupemafovizafisubisulu.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/62097287375.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/92236618145.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/zawowenavo.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210910051342.pdfIn PDF document text
    • http://yilip.net/userData/board/file/seribufemoxi.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109090849205444.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210905_065940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sex+mod+gta+sa+androidPDF 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_off0000b90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90A 19460 bytes
SHA-256: 7f22618a13e07f10dd7426ea5f7dd8bc34e0ec6256c762c8fc1ce5432bab797c
font_01_sfnt_off0000ebfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10411 10720 bytes
SHA-256: b029ccebdce38f567c54d9165574ed71075d61f5ea37aa5b4683ec045a2d8ecc