Malicious PDF — malware analysis report

Static analysis result for SHA-256 1918a4b695f1a235…

MALICIOUS

PDF

79.7 KB Created: 2021-09-12 11:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1e37ab32ff6b3fc05b9dab87eaa049af SHA-1: 8611d44660a188a273bf3c43bd287f65bfdf9d00 SHA-256: 1918a4b695f1a23584fefff0d2ecc3cb1063e14611843150f80b4cbb4aa11a92
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The file's structure and URL patterns align with common tactics for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://bestorkate.com/uploads/ckeditor/files/wevelori.pdf In PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/6fe71c9420ddc452d794d5c00b74ee10/lupalunuwifevodan.pdfIn PDF document text
    • http://koutingchina.com/upload/files/1259939801.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/e2ka6b73bf971suskivq9uikb0/jafexelegafogutepetek.pdfIn PDF document text
    • http://seto.cz/uploads/laxutu.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/17617450791.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/63691241892.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/76968173161.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/lasibaduwoluxokeg.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136809cd42cd---89626735400.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/73554969608.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/xonin.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/66889999291.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/sijisizuluvorobej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=android+get+app+data+directoryPDF 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_off0000d5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C3 17084 bytes
SHA-256: f7f1ea0a1d1fab2be1b0fe7bdd45e45421c2d483963746d92fd98b477563ddfc
font_01_sfnt_off000101dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DD 10568 bytes
SHA-256: 20080199564a1ecebf331b0dd94baf5e058e1588aebe8884a4bce050598b5dea
font_02_sfnt_off000119e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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