Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0898788bfe39b7…

MALICIOUS

PDF

71.8 KB Created: 2021-10-02 12:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 37fc7cc5c4680501539750c450875dbc SHA-1: d3768001d5749c77e2283789a872963e2896f1c4 SHA-256: dc0898788bfe39b7a6960d6711e3166df0de8fa2c901f679c89ce52fe6a5f2c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the presence of link farms pointing to compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://irlanc.ru/uplcv?utm_term=hgh+before+and+after+jaw PDF link annotation
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/620ce2c5cbe0369004619778a0f8d333/vasulepewesozujewer.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/19917068296.pdfIn PDF document text
    • https://rjpexport.com/files/jomedomobudata.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613628f55d611---lojofukesemimasilesubuv.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/pazolurukozuridexidifuren.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/livebekivudujeke.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/63707376198.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/mamifudijuzokoga.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/85748298029.pdfIn PDF document text
    • https://paramourpourbebe.com/userfiles/file/mopaj.pdfIn PDF document text
    • https://trieurodata.ro/images/file/giparapeser.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/lukus.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613572e27b3d2---xajufirifatuvekukitoras.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/supevudu.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/94137507898.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/kukubebegemepovibije.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/xasevuno.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/roloza.pdfIn PDF document text
    • http://infosierra.es/images/editor/87999201231.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/89651950236.pdfIn PDF document text
    • https://digireg.it/upload/ridakeveju.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/19193a22d9fcdae62e4b82e18c7518f0/vajazopizopafujegegetanix.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615685ca01337---zupixolawa.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/75206996228.pdfIn PDF document text
    • http://theblare.com/image/upload/file/redaladudubi.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/36046621458.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_off0000b504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB504 17404 bytes
SHA-256: b824a35498c7cc46bb9ba96251340f34cd43eb975999ee2e0308467ffadd4de3
font_01_sfnt_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 10676 bytes
SHA-256: 0bb92d33015a55f4612c2946f9cdc261cbab679e228d50b2e6ab0a23078ad917
font_02_sfnt_off0000f9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1