Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd7e75b736fd730…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 18:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9616dbfd6ea1cd9bb0b98eaca0527aaa SHA-1: 443eb0dd8c984f4ed52ac8416c693d89d51cfe19 SHA-256: 8fd7e75b736fd7307ad5df68c9afa03450606cdda2e460cc8f02841fdde0484e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable or compromised domains. Heuristics indicate these links are designed to redirect users to external sites, with one URL specifically mentioning 'cheat headshot aimbot apk free fire', suggesting a lure for potentially malicious software downloads or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

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=cheat+headshot+aimbot+apk+free+fire PDF link annotation
    • http://2sisaccount.com/userfiles/files/bixoreduriwur.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/73109749429.pdfIn PDF document text
    • https://gtpoznan.pl/cms/files/file/madodenufunux.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/famudajoj.pdfIn PDF document text
    • http://runo34.ru/attachments/file/palube.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/papitaziwemipulajoxamupa.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/pamanufadezigowate.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/70290128369.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/diwikewu.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/nofufukekemu.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/fokedinis.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/62580294421.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/4646089543.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/77191087910.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/74088835652.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d50b6b9591---41787377214.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613baee857cca---dakogetiwa.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/rupopivejo.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f13b348919---viwomiruliwoladoxef.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/fowupedawera.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/69961388823.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/junebajidununovexeket.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/zefapigefujagonogutoriwa.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_off0000b272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB272 17732 bytes
SHA-256: 2e57c226f6e6b89624b985674ab1a75ec80b45b2eac2636204f4cf530c7ccbf9
font_01_sfnt_off0000e109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 10876 bytes
SHA-256: e6372747b6c80e81d38616c4314d824d6adc24c3632a39caa44552d357464101
font_02_sfnt_off0000f9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1