Malicious PDF — malware analysis report

Static analysis result for SHA-256 634dee05dffb8599…

MALICIOUS

PDF

83.4 KB Created: 2021-06-09 22:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 10fbb8b74fda9ff66562ed05b6e9f7ad SHA-1: 7c6fb3c06acb04f5183e1fc0a3bea6be66b74365 SHA-256: 634dee05dffb8599d2865e9a7942627095b06a281968823246b1f6ac2679c691
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content. The presence of a lure related to 'Gta 5 san andreas mod apk offline' indicates a phishing or scamming attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=gta+5+san+andreas+mod+apk+offline PDF link annotation
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608382726d956---97491377878.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/xiwalikiduzogapixeposiwa.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/bilukozilamasunufi.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/31411954528.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/f01n0ugli26m5oje5t1fl091b2/88656253223.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/488034c958de8443f822b1942e2d44cd/74236934948.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940d2fb78fe---47766837458.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c10dd3e2c---49004074380.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fceec78349---ditebogemo.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/lrcb9d56lghr1qbbik57ish111/86289817255.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/momep.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/fitejemibinopomapolego.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750fa9c8a50---demozozirixuwojopef.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/pemujonitobodug.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/leduvebanowibawilapukured.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1533dc8c34356ca857ff0e1526a0a0bf/47390102932.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/takop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 5196 bytes
SHA-256: 4a4d33917efec3f08b3438e903a0d637a65bd8e4187c320252be1142fec93790
font_01_sfnt_off00010afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFB 11396 bytes
SHA-256: 355f624cd91f9b11ac97c70b59e4a9826bff0bdf6d50cd77ea401658f5b4c89a
font_02_sfnt_off0001305f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34