Malicious PDF — malware analysis report

Static analysis result for SHA-256 a317894c222efc5f…

MALICIOUS

PDF

91.0 KB Created: 2021-09-02 21:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc4f93707df4b3f5f7f6794fc5981dcb SHA-1: 1825dbbd49123c3b5843e224f59864ee9770545e SHA-256: a317894c222efc5fe78b8d07d9d2de922b028bf484a409399ec5c2ad5893b5f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bfe94b4168be0aa2fbc891209dd27005/lemixulopapagu.pdf In PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/64210604695.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b744a4d11e0---winogodiwor.pdfIn PDF document text
    • https://goodline.by/userfiles/file/gerubadelovoziwalumuwo.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/87269234819.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/sajegepute.pdfIn PDF document text
    • http://tafoto.de/img/upload/files/vepinu.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/3c217b2b18540a229e46cd424e09935d/gunoruzerowum.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/sivet.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/sodekibosetuvuxuzopu.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/dibejobimona.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16085318d31b79---52598964513.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/92107112935.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/29645569858.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/45404390467.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607365c1482fe---nililutijamur.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/tejilonawimuwenijud.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210621091120.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210628050221_c545vl.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/29795137430.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/vunafijitofa.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/90460380257.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/vowogekejedibekuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=exercicis+ortografia+catalana+3r+eso+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_off0000fc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001148b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148B 18904 bytes
SHA-256: 4e7177eaad9b5d78f527d5cb5a4f4c0fa2c09010fcbdf2a25805ed31ab6b728b
font_02_sfnt_off000142f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F0 11052 bytes
SHA-256: 60d9b26b0c224381cc0a182b23ebbdee3da218f6dc0ec5ee60a63990d8e721e1