Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c70d2f49e092ff…

MALICIOUS

PDF

87.6 KB Created: 2021-09-07 09:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7d2c9860087178d180eade22b756fe8c SHA-1: ce2b9ee00adc0e346d9f70854526cda043aa41d7 SHA-256: a8c70d2f49e092ffd7ffd987344d7e818a1858d712b4d8bafdff71f59cf17b4f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. Additionally, it features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malware or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e244f4730f8---73201015755.pdf In PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/marovajezo.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16109298896697---nidesisezapum.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/nilawalabebodotoxux.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/50785898766.pdfIn PDF document text
    • http://synergyproperty.com/images/files/30708640798.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/91545144087.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/pemiwuzemigekadupaminisum.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/2771269993.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/70560700799.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/xunulavurizuj.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/ripifuzunax.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3f6289533---30247900796.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/93793769735.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/lawenapuwuxofali.pdfIn PDF document text
    • http://lovesenergy.com/file/4493701678.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/pomadupiwaredopomabikoni.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d679dbfec4---baxob.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/47096775243.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210802155344.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/totad.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/20246170050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=planejamento+de+trade+marketing+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_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 10896 bytes
SHA-256: d14abb6eb647b453ee4608179be61a781164679c0eb3977af7d98bf73f7f82b0
font_01_sfnt_off00010b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8F 17272 bytes
SHA-256: a7607d099133c887dc48c9f9dfd3ef279a56c1fc1be9e91d95e905ea86551523
font_02_sfnt_off00013859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1