Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b99d93e867a612…

MALICIOUS

PDF

84.9 KB Created: 2021-05-25 18:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 51f028902fd0f97629a17c78c6ed1395 SHA-1: d5a9f8d44e087ab1d35e445e71789dea43656188 SHA-256: 33b99d93e867a6128c33a5dbe7aeda6b05b789ada7c3439d1b6881fb6eac9ebd
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=furious+7+full+movie+free+download+in+english PDF link annotation
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfade94cf4---53093024473.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/adff0826773c10369acc6ea1406d4554/52105088167.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/75074068954.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8f62d1e4b4aa985db0108f0b7dfaf1f9/pujowadawidomo.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021052417121546202.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/kenufowesonox.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/3rvjnqovnfo0tmljmikf280184/josusodinibepijosexafofab.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/2eefb90bd0ea524a7f2e44d3fe7d0871/rajevavuwefewabene.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098d9e03a152---fupoloseguw.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0dec3e5d5---59355799210.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160abc7bccfe99---63277411391.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/vedunipuvakatatitupif.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/8cc051ec0238ada37f17ce62c67751d9/91600509279.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/r3864a2un29jvsno5n6scne1c7/82247479853.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/30646032026.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160987bbe9bd27---dopapotosenalififeverasu.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607220ca1e7c5---pipixovenebusexanajafe.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/kpvefdc2do05svdo314mur9ulj/82460910136.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF72 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off0000e059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE059 5508 bytes
SHA-256: 8923f84b14f782edb2d87de7771bd7fe4c65f315f8ceaaaff356bbf91765384a
font_02_sfnt_off0000f300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF300 6576 bytes
SHA-256: 75f7df03c5c9156c8bf5e9af34122292f7be2369951f4f322a8104d04d4d8116
font_03_sfnt_off00010917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10917 11296 bytes
SHA-256: f679f5d5fcc1f468ef33f5e92ab5e2001fb824ec631f9ecd80b138bd4bd8528c
font_04_sfnt_off00012fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD9 16216 bytes
SHA-256: 69d448bf76c175de9f0a536b3db97361ec1b9564e5402488fa2c91540ffd033c

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