Malicious PDF — malware analysis report

Static analysis result for SHA-256 625b6620aac4394d…

MALICIOUS

PDF

70.4 KB Created: 2021-09-17 18:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 545065b76813815040e3a55812643118 SHA-1: 1e435fb87d2e654665013aa0b8643b8165680ffa SHA-256: 625b6620aac4394d55e41de59e557fea2ff89694d276ab4ac43a64cbd19d2a5b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inwebjor.ru/uplcv?utm_term=number+codes+for+words PDF link annotation
    • http://xn--49s538bo8ux8c.net/userfiles/file/95551302377.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/u4cmu7rf8td6krkic8e43u1p72/42222703522.pdfIn PDF document text
    • http://marine-inox.com/i/File/98178417060.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/m1r4407fmft5na0tif3ev9rs96/zijazudusaduwevejeni.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/jagupamoriru.pdfIn PDF document text
    • http://andreevka.topmebli.com/content/xuploadimages/file/95172598669.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ff2138b8d---lurimarepitipanifoz.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/vorijuziloput.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/zejugapiduzid.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142519d1dabb---pegepevorifiwaxofafo.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161427744c5c4c---kelusezabenizezip.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/lekezatevedose.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/43047564368.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/18483393711.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/496e179eccdabfe28b9e4b04a4c5780b/lilix.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0ca396a54b461d1fae982e0f5f19cb98/sesiremexujepipoma.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/41295184278.pdfIn PDF document text
    • https://iwistw.com/upload/files/boperodesewo.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/31045533055.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/55701162858.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6144058C61288.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/9269442185.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/tenomebekorexewexuti.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_off0000b5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD3 10440 bytes
SHA-256: f9b49524760422ad284a0fa43166ec8cc5fbb8f483cf2a6600f74329ee34f786
font_02_sfnt_off0000e58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58F 15232 bytes
SHA-256: 8a3e532440a5c3f14f365d97f0740a1b2f6eae65ee40df5d74712208ce6dff63

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