Malicious PDF — malware analysis report

Static analysis result for SHA-256 854697dc43d9da5b…

MALICIOUS

PDF

92.7 KB Created: 2021-06-14 06:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4e98166f55adc1436f79bf6a2f8175a7 SHA-1: 224678c188d6e89e2ea2f757f8eb7f54db39f5b0 SHA-256: 854697dc43d9da5ba12ebfd7c18e653d7b4cb5aa8c1f6b7f1759fcc57aa83ed9
164 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ClamAV and an ML classifier, and contains numerous links to external sites, many of which are hosted on compromised WordPress installations. The document body, though heavily obfuscated, suggests a lure related to "slither io hacked apk", indicating a phishing or malware distribution attempt. The presence of embedded URLs and the link farm structure strongly suggest the document is designed to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=slither+io+hacked+apk PDF link annotation
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b0dddd5d35c2f01f363614cef44f0e54/23138665594.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/42964302976.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609844a553353---wevazajepapeluxenamotupos.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f964414dbc---25544264865.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1653497553---55511175143.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/bc1e2642f0f4b7e7c5aa8879f3df43f3/98943045229.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/92113056724.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/tufanukubabebewebofog.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c86334a4ff---40980763520.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b713c3bbe---kolipe.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/77020628080.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608662dc9d20c---wepifo.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0e1ae3824---65396662944.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/9907cdcd7589c9bcd990f42c845ef50b/ponejukadiz.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/7dd67f138348d0639985c56b02c91657/75899274800.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013279.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13279 27656 bytes
SHA-256: 85927f43e1ab5f4a5c88dad2eaf4bc8f52c20ac6bd96dd3921a69ae68255f460
font_00_sfnt_off0000eca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA0 5152 bytes
SHA-256: c8ff81427a1692fe54667fc51fae434fec9b8d4a5af85f53d3fcbdf504c98140
font_01_sfnt_off0000fe11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE11 4120 bytes
SHA-256: b211e33e0d6004894b9d8c56f00253464af6302eff6beeadb09e7c532f7092c1
font_02_sfnt_off00010c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C88 11048 bytes
SHA-256: 3e72e3567782128e734cfe5c533e536077fe7d798d808e880bccd2572d867dd7

Open this report in the interactive analyzer, or submit your own file for analysis.