Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9055d9a00e726ff…

MALICIOUS

PDF

68.1 KB Created: 2021-10-01 00:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d7f53822307a048bb51fdbb0f7d673e3 SHA-1: c08dca7e4ccf49daaf2c3978b539afcfd36bdbae SHA-256: f9055d9a00e726ffcd338ab7d462fb33f23f210bb3ac2b39ee6da81dc7c91d82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to distribute phishing content or further malware. The embedded URLs are likely part of this distribution network.

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://infrive.ru/uplcv?utm_term=anime+fanz+tube+download PDF link annotation
    • http://iphysiology.ru/upload/91531880324.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/karisitomukakobukuwu.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/moxebifu.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f219fd106ae907f706043146a7553fb9/27326604404.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/radesaxuvupimiriru.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/63883672085.pdfIn PDF document text
    • http://kingsshopping.abwingsmd.com/uploads/files/45062756627.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/sisujubazixu.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/66217110318.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5aaeafe67---64581229406.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/fabaranejag.pdfIn PDF document text
    • http://grabnerestriche.at/75010399362.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/74821912329.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/25458692940.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f6d88b934---94402887544.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/43487560317.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/vubonaradedofataz.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/57309753162.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/23477849538.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/83624889843.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-9/20210909041956212208.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_off0000ac48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC48 10612 bytes
SHA-256: d3e518c7a6779bb05004548d2faa74b44e91b6553fbe139aefbf7fe3d6d122a7
font_01_sfnt_off0000c49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB1 15364 bytes
SHA-256: d63325fa469a6a5f72ca697dd190fdcde1b3600c1cc97a75055fe0035483232b