Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c684fa865a47c0…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 04:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e1908c26a15c7da02fc290853c9eb4f SHA-1: 77c197271b6bcdc8590f600da750cf4dff309650 SHA-256: f1c684fa865a47c0ddd6d3d5e4c02473b5bd453989cda06a672364eecb73afe4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to obscure the true destination. Heuristics indicate the document is a link farm on disposable hosting and points to compromised CMS uploads. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cructi.ru/uplcv?utm_term=how+to+draw+a+minecraft+emerald PDF link annotation
    • https://emmaushuis.org/pages/77456096512.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/nejaruvakugebetivad.pdfIn PDF document text
    • http://mastervin.ru/files/file/sotujofemigirafupo.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16078a06034df2---5918016178.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/36497890686.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16106e60aae8bd---xaruvirupobaxiguwemosi.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/32583027678.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/tixuruburefukexi.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610604fcade32---24819250097.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/pubadiz.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/foxovabuzakekiriw.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121783e61ecc---95328818754.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/rufavizezevo.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aac754143a---26793923340.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac07364bd4d---bajelemagofope.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/12479787440.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/47446795156.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/86662178640.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/64675732976.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e338d868fce---60654519063.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/moredazoluzadamagonut.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/gu6jb0qm31ksg0ps8vc0p9p7al/74770707783.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/wudunav.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_off0000d63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 17496 bytes
SHA-256: 8bb40960386e8e73de6b8b1cd0b1cf4f7431971e0936a3e52639aee7ba856365
font_02_sfnt_off00011bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFE 10548 bytes
SHA-256: efcffcea03e437a31000627dc3d08e97d6218c63037ba559af9dd250058db770

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