Malicious PDF — malware analysis report

Static analysis result for SHA-256 265c78d0e775dc5a…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 01:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a6c5d2786b23f030c36d404a5ad9520 SHA-1: 878dc9e40052f4ba16b71f900cf71e7dfa99e225 SHA-256: 265c78d0e775dc5adc12a7fb62eca38ff9ab772ea316f5fddc93598c13ff359f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://infrive.ru/uplcv?utm_term=android+email+calendar+app PDF link annotation
    • http://familie-schiecke.de/images/file/topavafukewam.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/xunevo.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/rimijakopi.pdfIn PDF document text
    • http://blgjad.com/upload/files/32981032303.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b986c5ac---zitedimuzev.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/6719084611.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-07/210907001743079539pbbvrrkpowns.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/4288887082.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/52042638861.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/sadaxoluvajelaginiregadeb.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/difuj.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/98557740024.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/gumono.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614154d420908---lonazug.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/59079489045.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/64373946486.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/nebudozo.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fded542b6d---kisiloxuzela.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/f612e3bf8df6e3c333bce2428c78e72e/dewuve.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/gokeketeze.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_off0000e308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 10392 bytes
SHA-256: 022fd0ebb6096d11e5a357d1a1514080110d39711ec862769dbcd1caeb248099
font_01_sfnt_off0000fa70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11282 17304 bytes
SHA-256: 3e595410b4b5bd8b6759a46b3e0c179d491304458a0c014524083d54019f5aeb