Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad34f8c9d3b2f17…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 10:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 638c77b6b45191e84a56087c6ac2ebf6 SHA-1: 4f8e584c9f3452d255f60359229d1906fc9f1986 SHA-256: 3ad34f8c9d3b2f17ba23931377dc3bec7efe49c3e5983522e8edddb3313395e6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=sheikh+saad+ghamdi PDF link annotation
    • https://juniorclublivorno.com/sitonews/images_upload/files/39461743606.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/memere.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/dimotivebodomux.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/41743364336.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/karolivupu.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/52166197284.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613003a15f486---zebepagitezamusopugag.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/nelaruwodofilevajir.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/fudiruw.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210913205118106191.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1614342f27f24c---lodixif.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210901225314.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/20865674315.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/89819811752.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7010fa84096c8ab8c4f7f5a3c809f307/37859249804.pdfIn PDF document text
    • http://apart1day.ru/file/jototuridoxoselazad.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/99776217382.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/8716526611.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/panewaxukizejimewalifa.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/73160513160.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/jazuwodesidexetajezaxe.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/19823327783.pdfIn PDF document text
    • http://runhouchem.com/upload/files/wesiderojisijokekakutokav.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/84676264499.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_off0000d3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF2 17604 bytes
SHA-256: fb14bc191960ed21399a0d0a1a8321b6809a1ab20b72c232d7b6cc87451649a3
font_02_sfnt_off000118bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BB 10396 bytes
SHA-256: d4d4ae039183bf51d5b1a7904a4eb0a97e3a312c5327ba7169688eb4e872a6cc