Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5ec94cbe6cba4a…

MALICIOUS

PDF

77.2 KB Created: 2021-09-19 20:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 28f58000243802c181c28e56aa492d92 SHA-1: 6fea2a8aa141e1124cf706d13656ddc5ef9cfd07 SHA-256: 8a5ec94cbe6cba4acc667a666824e62e9fbbff7a467f173a275e33b1c016a78d
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://ldksolar-officialliquidation.com/userfiles/files/75928709408.pdf In PDF document text
    • http://lavalnerina.com/userfiles/file/tanomuvadubujisos.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/81483948574.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c18459c8a2---vanenotikolan.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/195b96d8024a368affd79e7c678c6707/nuzuj.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614715efb6eb5---15003331020.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/jefojusogarafijejud.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/gusidufakirorel.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/41683063108.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zivutivebu.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/97978555535.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e5068b59d---tujasosifi.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/25258623666.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/kusupupidugimaz.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/gelezosoremedobafozegenuf.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/20655689883.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/48756748931.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/21290720485.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/fufax.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/90469508626.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/najewekebuxojam.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/75541028314.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/28778640669.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/pojedukovizojubeborovemeg.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7302b915d---59373024167.pdfIn PDF document text
    • http://julianina.de/upload/file/94460364133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cover+fire+apk+downloadPDF 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_off0000ccec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEC 16428 bytes
SHA-256: c33697496dbae0015a6aa597ba64281689d73abb931d06648a2fb9d56c6ec8f3
font_01_sfnt_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 10500 bytes
SHA-256: da87cb32d4f0cd13d8d32ac3e6fcd6361e4cd02bcc801b793aa7921674289243
font_02_sfnt_off00010f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1