Malicious PDF — malware analysis report

Static analysis result for SHA-256 550083cbcec24de3…

MALICIOUS

PDF

68.3 KB Created: 2022-03-29 23:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-04-04
MD5: 5445f1440ca2557d1a4f680f88fecc43 SHA-1: 42415160a7ebcbfa16573dcebd416dd8e46dbbba SHA-256: 550083cbcec24de35bb518d6a1d0b01091c4c0091be3547efd5d8691a69630e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to other PDF files hosted on compromised websites and disposable domains, indicating a link farm or SEO poisoning attack. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further malware or engage in phishing. The embedded URLs and the document body content, which includes phrases like 'Present simple with wh questions exercises pdf', are designed to appear as legitimate educational material to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ingmarcofaedi.com/userfiles/files/5011177501.pdf In PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/162020abfee335---65546227271.pdfIn PDF document text
    • https://www.scrs.in/kcfinder/upload/files/1822703764.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/3941e35ff1abcef413226ae39bf3e353/jokimijoz.pdfIn PDF document text
    • http://eidatlantique.antevox.fr/UserFiles/medias/mutadenijelabusifegijo.pdfIn PDF document text
    • https://muzifadisuluso.weebly.com/uploads/1/3/5/3/135347683/538725.pdfIn PDF document text
    • https://xamegazu.weebly.com/uploads/1/3/4/4/134440804/tetebupijubipo-bekiwida-dakizepi.pdfIn PDF document text
    • http://olapromos.com/ola/uploads/editorImagesfiles/83507353808.pdfIn PDF document text
    • https://tafubevodila.weebly.com/uploads/1/3/4/0/134016741/befove-pakotu-bugej-jibetezog.pdfIn PDF document text
    • http://home-plast.ru/foto/files/13257033813.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1620f0b09113a2---928272063.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/luxipududadix.pdfIn PDF document text
    • https://xavaruren.weebly.com/uploads/1/3/1/3/131383751/kakuxi-kinorifew.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/9215511168.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/gesozusapisigofupa.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/19739783600.pdfIn PDF document text
    • https://gidakilubokaz.weebly.com/uploads/1/3/4/6/134607675/tezofatebugijudegaso.pdfIn PDF document text
    • http://krajcsovicz.hu/kcfinder/upload/files/bugikadisan.pdfIn PDF document text
    • https://www.italianamaterassi.it/admin/kcfinder/upload/files/342832768.pdfIn PDF document text
    • https://zosesudemosovar.weebly.com/uploads/1/3/4/8/134865665/0869a3f.pdfIn PDF document text
    • https://ragaz.co.za/YmrXLWy8?keyword=present%20simple%20with%20wh%20questions%20exercises%20pdfPDF 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_off0000a93f.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0000a93f.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA93F 16060 bytes
SHA-256: 7a7560e66b773b0888a3941693486538e03b27a985e570d93119cc736ff1f0c8
font_01_sfnt_off0000d2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C4 11156 bytes
SHA-256: 487d418f685c67ae07e30216496d2d69bc49832805dc105b7b4b445f53181ea8
font_02_sfnt_off0000ec80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC80 16416 bytes
SHA-256: cfa2c3fbce80cc5607e01af033b793d17c57c214fb1d96e845eedea48cccd336