Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62a30ffbdaf1254…

MALICIOUS

PDF

100.5 KB Created: 2021-07-31 10:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 88f3903a7420ec25984ca0db14290305 SHA-1: 6b323689df823d6a42e3a955324917cce9df73f2 SHA-256: d62a30ffbdaf125492e64108339e2b5707e484ae4c7854e9dbb22d539cba0ae7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/5dcd76daa5f9f9df56a4c86e928cb0f4/62025550449.pdf In PDF document text
    • https://archielectronics.com/userfiles/files/38443348177.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/81150670736.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/95730318214.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf9635f4dd---78279494518.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/rosamizukuwelunimolori.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/63855590436.pdfIn PDF document text
    • http://shophouse.info/images/files/ziwulage.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/fc2372d9c84b7342a584aa7e68d7d3ee/wodigafatupabumumexad.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/36c93c1771901384d11a47f2d045e82b/89073330699.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/20783035163.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/8882502072.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/8b205ba2f3a37695c9db5ebdaf3db77f/fejafawijakaja.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/fajalunozebukow.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccba844ac3---64493325475.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/1uqi7h387n4tjvf4a48vf97i86/9813764918.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bd9fe8a06---93461145588.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/0c6d26c5521c652edefcbb7cda6bf874/9360743966.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1af3d38444---roxozulitukubezofaw.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/57579316319.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/21314953600.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/5794431113.pdfIn PDF document text
    • http://email-database.info/userfiles/file/zowep.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e67d7b61b---puwugupisilozitofaxovij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=free+ethiopian+orthodox+church+books+in+amharic+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_off00011579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11579 23384 bytes
SHA-256: 0a0a2616d6d84328286357055425ccf88ea2c57563ca679e37150466d464dfed
font_01_sfnt_off000151e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151E2 11248 bytes
SHA-256: f2d5bf7ffff9bc384e61eee0711b2cee41e807143d97064b703831d07185fa0a
font_02_sfnt_off00016bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1