Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbd175f715db7fa…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 21:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 51b0d8ad0a7dd06787c3ce650d7660e0 SHA-1: 46608d584188f4c8b5c508baa94305d305e88a50 SHA-256: 8fbd175f715db7fa612be77a2f55ac0cf01f82337f8cab0098fe969e7e590794
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external URLs, many of which point to compromised CMS uploads or disposable hosting. This suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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 https://inwebjor.ru/uplcv?utm_term=mix+by+camera360+unlocked+apk+download PDF link annotation
    • http://demo755.webbazaar.com/uploads/2772803527.pdfIn PDF document text
    • http://abpaluso.com/upload/file/ruvesu.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/jaxem.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/pepozitoruwitafijuko.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bb41314b5---rigawofetijerokuzar.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/74866310544.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210904_04F18C6A27180538.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/jbl3iu6g3aqlr87r1hjmlg3h5s/vuxosopiriketot.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/loguwemerit.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/93284893210.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/tidezuloniwi.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/lipib.pdfIn PDF document text
    • http://secretinvitation.net/images/files/62491920907.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/miwavepuvafol.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/4804897792.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/41864583721.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/filiwodama.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/92540038584.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/sobuwifazofage.pdfIn PDF document text
    • http://strandedtattoo.info/file/fetotubibagidit.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/36951560583.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614031a4d7fa8---66556634474.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_off0000dc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 11496 bytes
SHA-256: ec87577ef0557941e0af3b6fb9572266ded7dc3261f08c9f48bd913de81fbb82
font_02_sfnt_off00010f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7C 17116 bytes
SHA-256: 813359095868a54b5d9ff2a60459e560916d538735d71a93a639acc7e9e4c890