Malicious PDF — malware analysis report

Static analysis result for SHA-256 522d924bfd68430e…

MALICIOUS

PDF

77.3 KB Created: 2021-09-19 10:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ff6a096a54f2b0aa69ba44ac42756962 SHA-1: c471f4b534135991917717bea8591eb85f3b247b SHA-256: 522d924bfd68430e2e6df80935faad286c6292bdb88c7daa33a249a5667f78e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. The presence of external URIs and link farms suggests an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://chcial.ru/uplcv?utm_term=how+to+merge+all+contacts+on+android PDF link annotation
    • http://madveras.com/ckfinder/userfiles/files/64227381421.pdfIn PDF document text
    • https://keongracun.org/contents/files/31268222426.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/nanarukibivenekagebu.pdfIn PDF document text
    • http://nenorm.com/files/files/70307056782.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/iuka05to82pdvd8tcifadrcuem/75546359088.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/67195555126.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/72045208724.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/bakafutab.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/vuserewumo.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6f426e3d724acfd9eadf5937bfd8a162/24293929783.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2c69e1359da2cba3c2c6aa15ed86e0af/muzameropavozagobujemor.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/62272878521.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/e168843591faba6e2bc4759b0dc3b6f6/giwokotubebi.pdfIn PDF document text
    • https://novsport.com/content/File/zelofolosidukafisiwaj.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134dfaca89f7---pepobebatunibedej.pdfIn PDF document text
    • http://lamay.de/userfiles/file/vefetef.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_off0000cc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC46 10788 bytes
SHA-256: 7d3d931e257b20694fea9a167fcdb97f9aa4ef1bb4d056b274194c0dc2a9da4d
font_01_sfnt_off0000e4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 16644 bytes
SHA-256: 7ae00fff29626d8c62a71d489a1908c3ce1bb5179f109ebc3849383a42f9b86b
font_02_sfnt_off0001100b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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