Malicious PDF — malware analysis report

Static analysis result for SHA-256 452fc4b9fc3108fd…

MALICIOUS

PDF

78.3 KB Created: 2021-07-15 10:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: b1ed68c9cd21280fcf1b6dfe784f855b SHA-1: ea2c98d3bddf1d63b3666bc5028447776082d9c4 SHA-256: 452fc4b9fc3108fdcae53e44545ba792eca9e8ed3956bc537bc418faf83bc835
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and link farms points towards an effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 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 https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/5f1aba739e468fd2832d3b60550f955a/nikokukagumabefa.pdf In PDF document text
    • http://maihome.hu/admin1/file/gatiterovijenobuwuminezu.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/vj6unb587g9nfcj7u6b4cajq62/29957969996.pdfIn PDF document text
    • http://for284.org/clients/7/74/7452b259410349f427184d5eaa48bde7/File/84155627682.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/jatiwamanemo.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/xunavozarowupamuzewes.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/skddjo10daamdhdurmtq12tbs3/fexoxolofofuk.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3a617e7a8---merixureguvosataje.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/84464776550.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc028a8007---rosukefuzo.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/7e8f349b77ab9b6b2b75c153be870fc7/foxomujixesal.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f7277c32c8738e56d6e18ca6e8524a11/21632914615.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/ohpcpjv9f06dd1rprgjaa51qt1/vixog.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/77241650962.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/91224248295.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021050221255273499.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/rsim2df5d3272kc1r42l73ao83/tuwezoteponegekur.pdfIn PDF document text
    • https://arerp.kr/data/file///rafuvofilenojozujul.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/golakijivamepapezu.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210714_6E7C1421AE4B707C.pdfIn PDF document text
    • https://sambelteri.com/contents//files/12102042681.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/jivibule.pdfIn PDF document text
    • http://greece-ex.com/xepusedav.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/f8806b37757b87394afbd305fd1c1e36/divumimuxivowitar.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dad6bcb8729---vilasozerof.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dd6a3a1c0---14070069579.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/58787478003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=informed+consent+form+qualitative+interviewPDF 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_off0000d0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D9 10988 bytes
SHA-256: 73cf0a6c5d7006917408cf9ac33c8e8cad5850e32fab7993170d4f1e1186c96b
font_01_sfnt_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 16180 bytes
SHA-256: 8a4484d05dfcb564ab0498f57b16411ae7ad9c41f5103e6e206de34a1170831c
font_02_sfnt_off00011358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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