Malicious PDF — malware analysis report

Static analysis result for SHA-256 987a183c222a7a40…

MALICIOUS

PDF

73.7 KB Created: 2021-09-11 14:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 49add49e754503aa2e4c46a952a6cc2f SHA-1: f54dbffb81256c4b7b3b77a8ba07f4b00c83b053 SHA-256: 987a183c222a7a407bbb47ceb466fef0b37af029cc24a5976103e8f7b515e628
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. It contains embedded JavaScript and a significant number of external URIs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. The primary attack pattern appears to be directing users to potentially malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://metalzilembo.it/userfiles/files/28588442638.pdf In PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/juvapotemebirawidexubip.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/10243073883.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/72204706008.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/mutiriwasupenumojekukov.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/xiwevuxuzodevavebirosi.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210904_FFE19868BE9D9980.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/4581790095.pdfIn PDF document text
    • https://digireg.cn/upload/metawideruferomubado.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5b52598e7---14709552336.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/losokufew.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/82046651384.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/89516848205.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b97c1ba4e2---37238719459.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/35640649225.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132c14f9f3a6---juminosewolejobif.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/66186212114.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/26011022396.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/padukipukotuwonisukipu.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/58028784088.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/kodijulitunagukaxer.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/36500151166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+very+hungry+caterpillar+japanese+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_off0000ba57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA57 17416 bytes
SHA-256: eb3f05123f9c5b9b0016c9da88e707d50d7d2214b9c93a9cef14c05a58b307a1
font_01_sfnt_off0000e76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 11152 bytes
SHA-256: cf5e42e432bc80ccb7c0064ac0b3e14c1b66d9212ebf0adb1f40fe18ab1390e8

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