Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b287d41e96c958…

MALICIOUS

PDF

97.3 KB Created: 2021-08-13 22:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a71a4df68e5044dc261bc15decc1693c SHA-1: 8f61589f41bda157b8f923e504c73995aff1704e SHA-256: 03b287d41e96c958647916a0c1f3cd981a483f726ab9283409d7b96ab2615ce0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting and compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ruoumoc.com/upload/files/71105649210.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/j4ejj3j9hedje8e0t1ta2l6693/bovugoxudivanumaxete.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610617fd7fcce---luvine.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd231d75de5---75299448076.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4b6c94205---pejadegiguge.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791277685e9---jipifipokilegozebitibun.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5fd174446---nakogoxepebobekatofuxusud.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3a803072f---33619020210.pdfIn PDF document text
    • https://soechi.net/userfiles/file/gurezazi.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce39678198---67930881203.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1735bf230---pudulolin.pdfIn PDF document text
    • http://haki.vn/uploads/files/xodotorewerilovexosud.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/jozumozerono.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/4633467913.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160723c2e14dc6---59283352353.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/lmk2dph5mrdgdm7t7ni5744an9/47102165916.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/zikonopox.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///92334518343.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/43623938735.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/1818226f4cfa8e7fbef3fb426119f0a9/detakodomurelopejefu.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/goturaniruju.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f98e70b984334b1f4ade7ff252795146/bexem.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210616143809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=gu%C3%ADa+south+park+la+vara+de+la+verdad+misiones+secundariasPDF 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_off000112e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E9 11136 bytes
SHA-256: b7e4d7d1fc7896e454b6d19768cb182037fb27533b915caa95d7ad41d63ff2ef
font_01_sfnt_off00012cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC9 18612 bytes
SHA-256: ef878781bc7bcc1eea9240096c5ae37324344f47d5ab29fb8db37a323aff9a42
font_02_sfnt_off00015c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1