Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcf7a1a4577b27b…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 22:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5eaeeffa6d1c5c40af967d7f7d745af SHA-1: 4cced55c8f66a31db782fbeb661bcc378ca0dec2 SHA-256: 4bcf7a1a4577b27bf1c83105ecbdaafa930f5513f84a8f724bdcbc6023b635a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The file also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, some of which are hosted on compromised CMS platforms. This suggests the PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cructi.ru/uplcv?utm_term=ts+grewal+chapter+3+solutions+class+12
    • http://abwcoliseum.com/uploads/files/nivujimefido.pdf
    • http://hsound.ro/images/custom/file/dujarumaxumutijav.pdf
    • http://ferrogep99.hu/static/media/file/sikaxexewaxunolurezefu.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f94ca44b.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/n85j61rm8pbkfbk4q7v2p2jrlo/vixazepolixom.pdf
    • http://teplospectr.ru/images/files/18518984869.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f740f4dd3af---78044440823.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/hjj5ls4q3iplq07dbi2ngoosn7/bajopataroluridapona.pdf
    • http://travelport.pl/userfiles//file/15182029843.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/ccebb2d806e3bfcde81c5534396a0625/kojaf.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48e0157029---gerewozarag.pdf
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/pafevexunam.pdf
    • https://profitaler.com/UserFiles/file/buzeziboz.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a70283535a7---65736494348.pdf
    • https://askisan.com/upload/ckfinder/files/49113649592.pdf
    • http://www.look4job.gr/images/_user_na/file/vurujulukena.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/75f335e80de713fbaae5a06c8c0c9767/nezojunozuje.pdf
    • https://cplastik.com/data/cms/file/47469007263.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c5de8bbb613---poripaxikarovixozuw.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/0c751e6568f1b39173c60bef19838517/47154400933.pdf
    • http://thaoduocvn.com/userfiles/image/file/61849491744.pdf
    • http://teplospectr.ru/images/files/18898334337.pdf
    • https://masihpt2.com/contents//files/visutozetu.pdf
    • http://aldara-latinoamerica.com/userfiles/file/vulitinufamem.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2c4.bin
82ac567a2f390054f4ee852287492423da3bbfbe1d19ec56ca43507cd5d3b22c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 18332 bytes
font_01_sfnt_off0001127d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 16792 bytes
font_02_sfnt_off00012a94.bin
bb7c7d8aed9ab869d13856dea89a6623797c9e959d9eb625ee3806b2231d66a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A94 11144 bytes