Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a73f56e53cd2de…

MALICIOUS

PDF

71.3 KB Created: 2021-10-02 19:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b20b146378c96c49a1ec0d72a61ca9f0 SHA-1: 6c1551a0fcb052172bece1ec304a3157ff8a2f46 SHA-256: 98a73f56e53cd2dedba04f3f90035365b05231b0e58883fec817f2d23f1ba222
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised websites or disposable hosting, indicating a link farm for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://garglob.ru/uplcv?utm_term=ganglion+cyst+lump+on+top+of+foot PDF link annotation
    • https://ph789.com/pinhsuan/files/file/16709924300.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/45703945966.pdfIn PDF document text
    • http://unseretochter.ch/images/file/36960321207.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/xigezaxapiranuladosuxej.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/2fda5253c903763f924013536e0bdf92/nulimobezag.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134ea3f65453---92015204194.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/89205852732.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/82636414398.pdfIn PDF document text
    • http://baove24h.org/upload/files/89954999596.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/gajumirowedezote.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/5427487535.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/tabasil.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/6a25e63834ff6fd843198629439401a6/warebonevevuj.pdfIn PDF document text
    • http://18554080.com/userfiles/file/pitov.pdfIn PDF document text
    • http://cpviettin.com/upload/files/56763612628.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/rabejisonoto.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/68073950163.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/10122363211.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156073967920---19736880506.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/gevinapomisewo.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/zexofezavoxidorenasidaf.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/73156894512.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_off0000b353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB353 10844 bytes
SHA-256: 9d4ea1675be0da28e86588bc67793597477265f00dcb0e2a2aaed9cb7f23d97e
font_01_sfnt_off0000cc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6B 17012 bytes
SHA-256: e51a659b29dcea95bc0f084a458d8bc1c84715689f65a2d566cfd433d0858208
font_02_sfnt_off0000f7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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