Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d476aafff711fc…

MALICIOUS

PDF

89.1 KB Created: 2021-08-05 13:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aca0231c8f85218a5b88144059a206f8 SHA-1: d478cdfd917495593240de350c915b3ee0e3d862 SHA-256: f9d476aafff711fc83fbfa91fdef0e0a55212b8d9cf897890d54eb62228d7d91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous links to external domains, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the heuristics and the detection suggests the PDF is designed to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ks4073.com/file_media/file_image/file/xutonanebo.pdf In PDF document text
    • http://cadelupo.it/userfiles/files/nusezut.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/54770883391.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/bapegulibopasez.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/18398308291.pdfIn PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/rogokonosirawemodawiw.pdfIn PDF document text
    • http://esistore.be/userfiles/file/37818411014.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adfd930419e---losome.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1626095309.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bada53580---lusukapizuf.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab2200917c---simez.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e575723c3c2---40366845253.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/ed9980921311dd02349294e1bbc612d8/rurolebadedodilaxanifeza.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/84787969905.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/b2tm94ghq1a47jeoo50v6vc3mj/66673294232.pdfIn PDF document text
    • http://goref.ru/files/file/zetosufivokokofun.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/78168523441.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/55f840d1f531c2fc12b87ea6e7dfe55c/69486717930.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16076d7323d925---pekexedozemozad.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160963da3527c3---78974827106.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/vejojudu.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/77340e820430b772ef7f12c6de7e1595/fefenuguwab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=is+it+normal+for+my+cat%27s+poop+to+smell+really+badPDF 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_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 17520 bytes
SHA-256: 0923a6e4b198be43515a8e8db1bfb09f6d1f783f02a30e76840e8abfdb435b24
font_01_sfnt_off00012505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12505 11020 bytes
SHA-256: 06a827754c23390ae02e302459207f65d533c960d3c119d9913a3b585b25f55d
font_02_sfnt_off00013e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.