Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ea232ef00e1057…

MALICIOUS

PDF

84.1 KB Created: 2021-09-03 08:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9da277a334b160c45dce9ee5ab8694c7 SHA-1: 481046bd23ca593fed4357fe57e3628cee5ee2fb SHA-256: c6ea232ef00e1057e53dc873d3699e4e2c6d3358f0ca48e1759251ce9e9ef37a
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS upload directories. This suggests the file is designed to host or link to malicious content, potentially as part of a phishing or malware distribution campaign. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084d86775116---tebezipepe.pdf In PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/nebitekifovaba.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/07243adfba87ac4ee1a8d8618099c9b0/31764675293.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/55414855071.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/sogavedazusox.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/49913714915.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/68a45efd402cdd9f9e1478fea03b9a0f/koraxusupoxujiwizo.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609204de2f056---3400407859.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/0eaf999ec6304aa8923b2814294eb795/pinigetupixu.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/62659392718.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/44445045390.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a9e138e67---14357258140.pdfIn PDF document text
    • http://midel.me/userfiles/file/funomejegitipim.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/81753826651.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bc851e22bbe8151d0ed18d618d93582c/pogizagojikajupimu.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/9494767011.pdfIn PDF document text
    • http://jpcadonate.com/clients/4/48/4863a0bac697dd4b44f4a1b1fb44835f/File/redufoxas.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac565305b04---samori.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160afcb12d5cfb---48671039455.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0087e3f5b---nafamarijelowovipi.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/88520588403.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737a40e6915---51774077186.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/39044617468.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608824c8b11fb---xedegajukikisuxasuvar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=southern+railway+group+d+model+question+paper+in+tamil+pdfPDF 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_off0000e02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 18220 bytes
SHA-256: 98b3022d73f56dad3d3f6cb476cc2c33069c937829699504a56710b2dffa5efc
font_02_sfnt_off00012824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12824 11468 bytes
SHA-256: 382b8ba7b0fc8030009de2a8a989104bcdf12aefd1bc2d5e5ebda887ff7440a8