Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b95c049ddf319c5…

MALICIOUS

PDF

77.7 KB Created: 2021-06-05 10:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f9d47794e3f95221adb3bf3c060211b SHA-1: 697a74c5111cde6a85b7b6288ab1ded8e410e254 SHA-256: 1b95c049ddf319c533460d7e015ad2a7e5dd74e87a21d2aeb0705a4b04489fec
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be part of link farms hosted on disposable or compromised domains. The presence of a 'download' button lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution attempt. While no scripts were explicitly extracted, the overall structure and heuristic firings indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=bruno+mars+grenade+video+download+mp4
    • http://matstravel.ru/userfiles/file/vopenifotitin.pdf
    • http://ahchala.com/img/file/81400152290.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ssp95e3u0stlit266vca1jdug6/43847855631.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/il5te5i44s699u95rlcdpgkv2o/38686550315.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08e4855655---woxaguwuvokaxupere.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160945f9ce3083---misarirafedud.pdf
    • http://mini-garden.ru/userfiles/file/56534587903.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160867663a0737---82894424334.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a4f151421---56376901455.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e316d5822b---73063925786.pdf
    • https://betenenergy.com/sites/default/files/file/65204233163.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e42140c357---ruwaw.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904aef2f88b---5635475692.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160793afab5986---xemexekedajokadop.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/2eaa2f7d400a201afb352cbc1b1ab46d/foxuzegepu.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/d3qrmuesb103gfugfqvb2tqitm/vumokewefenixo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d14f.bin
c6e4c4861756ced5220c020ec3e6991abab1cfc442b4d9c3d4d3cf8fb8cf247a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD14F 5568 bytes
font_01_sfnt_off0000e449.bin
a9bf670f0b55ec3d3a93101ac8bd9172c9fb783a0b1949bafaa09debce7dda43
pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 10980 bytes
font_02_sfnt_off000109e3.bin
b08ee7afd632e23f0bca8e1f8a2141cb3a8a9ed2ba2f72ae9b20a0ef3e5cbbe0
pdf-font-stream PDF embedded font (sfnt) at offset 0x109E3 18780 bytes