Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96bc7b7274ffb87…

MALICIOUS

PDF

95.5 KB Created: 2021-10-13 17:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e00c1bc578699dddb9f98c0bd928a809 SHA-1: 35c8d7e5d8006dbb3d7c331a4e540b774aec1cc7 SHA-256: b96bc7b7274ffb87884fab626fc4ccb7a01916db2d0ba9bd6d102827c3e19aa8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or initiating redirects. It also features numerous external links, several of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mabifitness.it/userfiles/files/81632352097.pdf In PDF document text
    • https://ismart99.net/upload/files/mesevijige.pdfIn PDF document text
    • http://nprofit.hk/userfiles/84836552828.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/mujemu.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/tumepusegazafa.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/67808003879.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/faneru.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f095f78f497457b0c6e32a0a2bde983c/11304031755.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/muderavijipaxofivavo.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/21593599787.pdfIn PDF document text
    • http://pedraferro.com/files/files/53940953246.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/fc3a55227cfb514438089ad14566d8c6/31811855096.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/julelemapageduvu.pdfIn PDF document text
    • http://4bx.pl/public/file/76098572708.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/15589908079.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/favesikumaritukiguwam.pdfIn PDF document text
    • https://citytrafik.nu/images/file/70428522967.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/50761008088.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/25808165274.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615626cc91e5d---pudorituroromavuz.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/fisafagom.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/vuwawub.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/56064060697.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/10538380844.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/1hHberoKktI/uplcv?utm_term=human+genetic+disorder+crosses+answer+keyPDF 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_off00010cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC5 11048 bytes
SHA-256: 42b25850e7cae424d63bacd782ce73bc725108716990e4265b149d4777645d48
font_01_sfnt_off00012655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12655 19256 bytes
SHA-256: f8c7e4c365a2ffa7a8c296d3a5e7383cf8ffbebc32eb9ed7c1aefa5b8bba4040
font_02_sfnt_off000157d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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