Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4632b0000cacd6…

MALICIOUS

PDF

86.4 KB Created: 2021-09-01 20:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c196a69e964e307312c4bebf568450e0 SHA-1: 5a66b3dfbd8a33b8d8afa925795c74b8955e438f SHA-256: 7c4632b0000cacd642510a6645b64ad5699bc37827972136102a9099cf69abef
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution lure. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://huntic.ru/uplcv?utm_term=thinking+bout+the+old+me+i+swear+i+miss+you+dearly PDF link annotation
    • http://bluestandard.pl/ckfinder/userfiles/files/foriwodalozomabigizisa.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/b60f90437dac706fe61f3b37e6a4786f/43698078288.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210727_133643_2226.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612e8358347c4---peliruratodozija.pdfPDF link annotation
    • http://www.rify.us/cms-uploads/files/62999794726.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/jonudedijiturokuridadusur.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/webabitewapekepoberonofi.pdfIn PDF document text
    • http://schokozentrale.de/idata/rokugazifofo.pdfIn PDF document text
    • http://omg.su/upload/File/gejidonigixuj.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/68230466219.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/kifuwir.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/60397786389.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/35108041489.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/nakomuvariba.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe60e52844---89184338582.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/pudutupoxuluraxu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/943ed60ece2b9a6ce65109b2b9f7a608/85077908927.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce35934c53---xolubipoduf.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/danada.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021810344327309.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/87334180058.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/wizesadaxezud.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/8dul7gvculqvjr01fduos89lo9/kekovazej.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_off0000e62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62B 19116 bytes
SHA-256: bf95c0e2daa42269da6fdf800dd2ad1627dccf27ffb39a44cda6ac4ce633754d
font_01_sfnt_off000117fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FA 11188 bytes
SHA-256: 288028d0da2409aafc9c18ab1663a260f7bb2b0891a8ca1fc91d6bd0a9cdeb42
font_02_sfnt_off000131d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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