Malicious PDF — malware analysis report

Static analysis result for SHA-256 913390cbda8080cb…

MALICIOUS

PDF

86.2 KB Created: 2021-09-12 19:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2ffa3f8b91672a170ff0972220cbea52 SHA-1: d1fe01a1a1afd08910b68e15fdc89a3d7ffee503 SHA-256: 913390cbda8080cb631fb6a2dbce408370247a4e6481cbb10bf5626d998cdb29
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://burmeseburmilla-allevamento.com/userfiles/files/6048177538.pdf In PDF document text
    • http://iktoktatas.hu/files/file/88224653624.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/37054285928.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/54265613562.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d20d018cae---bifigigizolegobik.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/15715871256.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/wopusagaxoboz.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/74365600636.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/rowejoxuvetemefefapabera.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613234f623ab3---59766811398.pdfIn PDF document text
    • http://dytac.hk/userfiles/72459086091.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613131cca70c3---segupov.pdfIn PDF document text
    • https://anakmeong.com/contents/files/wezugig.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/61272702611.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/xofaki.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/67597751754.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/mcg20sh69sp0mav490esfic2nq/64776868009.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/futiteke.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/kakukokuvikunuropijimoje.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/wifinarubinazimex.pdfIn PDF document text
    • https://guijek.com/userfiles/file/99018978952.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/niniv.pdfIn PDF document text
    • https://t2sc.me/userfiles/50672056108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=avee+music+playerPDF link annotation
    • 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_off0000e035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE035 23144 bytes
SHA-256: b37de952df560faa6ad8b58db305de92e2be94efed8289140a2ee85e18930d77
font_01_sfnt_off00011b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5D 10472 bytes
SHA-256: 152164051301893a765fddb7f65323e7aadf444717732c68132f6706d574f843
font_02_sfnt_off00013333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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