Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e556a650351260…

MALICIOUS

PDF

89.6 KB Created: 2021-09-20 13:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 06b65270643b59340e50993098eeb3b9 SHA-1: d3d9d908b2310b64eafcbe6691c9d510a642943c SHA-256: 87e556a650351260f9532ef32e867a527c4ba7aed37562374415b5eb43c9820d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=yes+god+yes+full+movie+watch+online PDF link annotation
    • http://digifast.cz/userfiles/7088095019.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614142c87662c---nejufanu.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/malinizebid.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/vosagiko.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132efcf38591---11543320392.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/nosusipitowaliti.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/26825900171.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/mekegizemariwimofapev.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/36777499467.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/somabobeziparotolu.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613444f008811---19571354739.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/ginaditekebimuboxilenuzak.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/82920889428.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/45145916388.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/4137204225.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/42781681615.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/kulisemonunafiragitafix.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/pejonelidibogakizalibag.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/rojabiwapomoli.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/58934567873.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/12811365826.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/88280699176.pdfIn PDF document text
    • https://avflash.nl/upload/files/5231724624.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-20-05-29-43-qgGrYmb2.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_off0000f98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 17596 bytes
SHA-256: d869f9c5da5d65d8d3b44dfb5012bdc4b6d2f230f92ceeab146ae1fa5c2aac91
font_01_sfnt_off000126bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED6 11172 bytes
SHA-256: c568d2119a8707b685f0da4f24254c3352470bb60f68a0556db6d1c6a4b26c08