Malicious PDF — malware analysis report

Static analysis result for SHA-256 3518a065fed18d70…

MALICIOUS

PDF

71.4 KB Created: 2021-09-17 21:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: edc6e0873aa1d0037bfb2ec26ed7793c SHA-1: 88d40b763e3d2d9ab631bb732c31ca0c187ea319 SHA-256: 3518a065fed18d707cb49a60aacccec274a4c8fc476456dbd60edacf690be497
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content or redirect users. The presence of embedded JavaScript and the 'SE_CALLBACK_LURE' heuristic indicate a potential callback phishing or tech-support scam, aiming to trick users into calling a fraudulent number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://serextion2006.com/js/upload/files/wotutuwovifuwadijapekevo.pdf In PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/2a359bb824603a551d8c0a8a11eac2b4/23363233688.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/acc2b44e14a6648f101dbff34244934d/77576786499.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe88fc87a1---36892692189.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/musuzegotaba.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16130a256496d7---63951176476.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109130505575565.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/kusigi.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210905171247.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161424e3a430b2---mesapetem.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/23742289259.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/xolizide.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ae9e9a8380674bcea9b77206ac411dd6/6073900447.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/xewifodiwuwiboror.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/47582763067.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/72557860515.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/bafezejesupawiwogab.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/gukilewadawugovadiv.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/fipiwaxiwekumuxa.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/robasakosarunofomexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=4d+android+wallpaperPDF 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_off0000b711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB711 10184 bytes
SHA-256: 7659af54a3efa5b7abd4df94c0a0df32b14b20b5c77e9bc3fc264ee0afbad982
font_01_sfnt_off0000cdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 16360 bytes
SHA-256: 8e6cee0398477a76356bb2e336cc0f5615829684341f39f7868c853b447f7ba0

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