Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e993846915b3a96…

MALICIOUS

PDF

96.8 KB Created: 2021-08-20 22:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 901d9e6e5cde4ea157b1c8c60bee70e5 SHA-1: 8f5f4af20ab05e19b96a3d0bcf50f81a80ff50d1 SHA-256: 4e993846915b3a9647e933116501094c5766af00c487146f8afe996686b557aa
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 point to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. The file's structure and URL patterns are consistent with a phishing lure or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://queure.ru/uplcv?utm_term=realidades+2+capitulo+5a+guided+practice+activities+5a-1+answers PDF link annotation
    • http://poiskvod.ru/images/file/11220316895.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/fonixebofeb.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/melapixanesisavuf.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/52978003270.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fc918bbb6---76713912579.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/35833017255.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/62016682212.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/77268470756.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a47df66fd65---livanegafizodibevebe.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/xetokabuw.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/1df8b0dc4d17b282952fc21db6877434/zokit.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090a65bc494d---pomufiluto.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1c7e7b085---fofapal.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/18611691172.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9fd7ce2ec3f2348cd42f79e1461c4211/36657496184.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/93085502402.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/613ccc60f70a2b760656eaf2229d46f2/65174872995.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/80875962318.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/dudivekejixuremikivez.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c52137c709---sulife.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/33765285063.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_off00011090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11090 19108 bytes
SHA-256: 2b4a50835407b1b54273bdbcbd308e333d67f97479e52be1df970a8464410a20
font_01_sfnt_off00014220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A37 11324 bytes
SHA-256: 87df838b4847708ff88b04db9c92e14e481e3a0e6aeb99d1aba10f24ea47a3f9

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