Malicious PDF — malware analysis report

Static analysis result for SHA-256 441bf8ca4dd3a391…

MALICIOUS

PDF

74.7 KB Created: 2022-04-19 20:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-05-05
MD5: 458f0b059a577fd834ec7a519dc3f718 SHA-1: 643ef1e4ec6b0a1be7049158c986732f871c7fce SHA-256: 441bf8ca4dd3a391649d8a8e0f38a6dc9b65fb43e9c64dcafbc94a0cc9c6136a
296 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Travel-support phone-number stuffing scam critical SE_TRAVEL_SUPPORT_PHONE_SCAM
    Document repeats phone numbers in airline/travel/refund/support language, often across multiple regional phrasings. This matches SEO/support-scam PDFs that impersonate airlines or travel brands and route users to attacker-controlled call centers rather than a normal travel document.
  • 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.
  • Clickable PDF combines external action with parser-evasion structure high PDF_ACTION_PARSER_EVASION
    PDF has an external clickable URI together with object graph or xref structures that make parsers disagree, such as divergent duplicate objects, parser divergence, or xref offset mismatch. That combination is stronger than a plain link: the document is both an outward-action carrier and a parser-confusion/evasion sample.
  • 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://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/162047c8dbcea2---46869059553.pdf In PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/31236686910.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1623456151437a---pomutatedatowu.pdfIn PDF document text
    • http://bausite.ru/userfiles/files/36453509654.pdfIn PDF document text
    • http://viorina-deko.com/images/file/fuzovataxesebiripisupiw.pdfIn PDF document text
    • http://0978059389.com/CKEdit/upload/files/86740809139.pdfIn PDF document text
    • http://inphilong.com/upload/files/timilobubifivojuxokuvekam.pdfIn PDF document text
    • http://formacio.fic.cat/uploads/file/jepenonuloguzopupagi.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/sikudegotonizisi.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/nanavafidibaluga.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/95727928017.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/75508999169.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/bajavi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1624c3f4467382---48768298305.pdfIn PDF document text
    • http://mirograd.com/img/file/80193958129.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/63520924259.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/pavunamif.pdfIn PDF document text
    • http://www.meditt.com/wp-content/plugins/super-forms/uploads/php/files/0ob27cg7uh4h2m7d9c3hgc53d3/norelevetixevafefes.pdfIn PDF document text
    • http://szcftz.com/upload/89133713977.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/9236625274.pdfIn PDF document text
    • https://podar.co.za/YmrXLWy8?keyword=how%20much%20does%20it%20cost%20to%20service%20a%20hyundai%20i20PDF 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 extracted file (font_00_sfnt_off0000bcdd.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0000bcdd.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDD 11188 bytes
SHA-256: a5803ee78822e4bd5a107d3062b5aa02a30f34400c64a24732287cbc94426863
font_01_sfnt_off0000d6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 17384 bytes
SHA-256: 93228b31b1f4ec92b7696472ba2c68acc991873df1d34296afd38edd21d03c2a