Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81279bba1f9de09…

MALICIOUS

PDF

81.1 KB Created: 2021-09-01 14:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 41472c2c8ba2281b7a1d4c9526a8059e SHA-1: 4246d35ae4eff51fde5086e78954e95ad1063589 SHA-256: b81279bba1f9de09e4c3c7ca8cf7a989c5284fb2c9cfd758502226308653b6f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of external links and the nature of the heuristics suggest a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crysiq.ru/uplcv?utm_term=free+screen+video+recorder+download PDF link annotation
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dc7690021---16109840406.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a73787a27---6716982008.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16105b10b2a8c8---winiwevixezada.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/domfitfs62jf1j34nufk0jfk6u/leragujozaz.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/34590807321.pdfIn PDF document text
    • http://accronline.com/userfiles/file/biwesafef.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/26269405185.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a089352a0934063989bee0df594955d1/61329649957.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607176951c3a9---bixiruwebefepakosigife.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/ca2d4c64dba561d47bd738955c665eee/69809526748.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/kapulodevojonevifozemaro.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/7eth7m5si74pap10paobk3ib12/67352074593.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b103f8a31f5---11860280317.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5577b1a5bc---98893744511.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/c85ad5a32b4f24eaeb16fae5046ba2e9/48973507511.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/zakupivovigini.pdfIn PDF document text
    • http://vodnik48.ru/content/file/65079161158.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/rovexajufegoworo.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/71911828124.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/18686109057.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/lesikujemesubufolo.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/bepinenijidew.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/f74df133be77ac7a6c89435155b30eaa/zixivelafogonededel.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_off0000d94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 18056 bytes
SHA-256: 17d5cd2c68372a01d8505a471e082313df0c766ecf885ce73d409774377290f1
font_02_sfnt_off00011f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F95 10392 bytes
SHA-256: 3db78df2e32c73c0508dcbfb726833079ec141ba3bd86effe793608ff1d13cef

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