Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f6b5945ab9ceca…

MALICIOUS

PDF

89.4 KB Created: 2021-09-19 10:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c72aa6d8c347fb618295de017e654e37 SHA-1: 7d74133896ce0072c6bd0ee82e0770b77b5ccea3 SHA-256: 44f6b5945ab9ceca5c73ab529f1a24a0a26f026774312458a2a1e9a29e93e021
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for redirection. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the exploitation of user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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 http://kfoodntea.com/dataroom/file/juvebu.pdf In PDF document text
    • https://forexinc.ca/upload/editor/file/kagapefasafana.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/45088941871.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b2e434547ccd057f4b15eb080f7f20be/mirixupejotajive.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/21088576525.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/nerosatozetadolakababizox.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/eaeb177fd98190fca2662294e7f94710/medanigalukesutesabofate.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/17729440416.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///99603327257.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/nowewefurej.pdfIn PDF document text
    • https://htchninc.com/d/files/mepavopupuwavusatal.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/13222141250.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210919114711162.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/3849866557.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/noparaxemavizi.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/2084230324.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/lonidepefe.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/bugosojosarebokama.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091006201399.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/dcde39c98218b5a1ed8f9a22126b4363/taruxoxanatakirutu.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/nejoti.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/kavekukisiwodolewaj.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/guganulomeno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=top+gun+2+full+movie+watch+onlinePDF 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_off0000f914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001112b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112B 10996 bytes
SHA-256: a56fe02f00da4596992d414c4659a4325d4c2f4a94708417e9043c5c3bed6968
font_02_sfnt_off00012aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA9 17596 bytes
SHA-256: 45e8bcd4d88a31d874e5687edd960d335fd7d1494830ce8177babf64c5bdd698