Malicious PDF — malware analysis report

Static analysis result for SHA-256 d280cda2e625d613…

MALICIOUS

PDF

82.3 KB Created: 2021-08-06 05:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 615405abb3c25eca082c779179d4d7fd SHA-1: 7bb6f90d3b20ad9598ee3297eca55b3ab73139a1 SHA-256: d280cda2e625d6130402df787de644b067f2f4cd971705dc4f9e1cf48ceea7f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://ketchas.ru/uplcv?utm_term=grade+1+sinhala+worksheets+pdf+free+download PDF link annotation
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075039aa1102---domulasiresikurakupat.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/58540627637.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/misa9f31aaut2mq3o359am42l7/levumizedejovazofanabevo.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qrlftqnn82rshl743rs6u76ue2/55280755322.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/26125849844.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/981vbm8ejq5ftnpj5e0vk68hmi/tifedamupivis.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/29627071957.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/9342aca1b2059pn704enca8soj/zerudipowosekevidawu.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2e3e27d7350b279fda09f4b647fc1d0e/50276772755.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/80423349458.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89309175762.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/tenudusawixoviweluji.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/duwozenodufugo.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/2260325193.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/27134075297.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/91335987845.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/9869689781.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608492fdcf618---57983292824.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/fafetavubad.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a12c2d03908---joragux.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/23909073733.pdfIn PDF document text
    • http://agro-partner.com/Image/files/gikodawawujusiduxako.pdfIn PDF document text
    • http://www.bash.cl/media/file/sevepuzefudiworuberivumut.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eff425e10e---19608175133.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/getarusinuzexe.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/7302a0580a4569d3531c6b2c28fffab5/62978952833.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_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 10864 bytes
SHA-256: acb357b6587c94ffac3a8665ce8a1108a7a90265653cb6e7e69d32738da0b81c
font_01_sfnt_off0000f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 16560 bytes
SHA-256: 1222f77d98082e8c131ed2f5ba0aeea70001a17952208f4f60b03f068ba92ec4
font_02_sfnt_off00011f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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