Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dbf3fa326f60166…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 09:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 826fa86db6cace5b24acd3b3e8d1a8eb SHA-1: 3306026d3bce4d0a4a0b0f3a3775c9ba14626ae6 SHA-256: 3dbf3fa326f60166bdbee651de22a797c53a8a9fd1a36e8b375eb630ff6f9264
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, with several hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://teamtrinity.net/trinitya/file/73511114547.pdf In PDF document text
    • http://stamforgtechnologies.com/uploads/94945135618.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613257dbe737a---90272486543.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/5733164651.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/gaxedamago.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/81192874871.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/92729769187.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613703162683a---kewolurepo.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021918102589637.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161417a172ac35---sarafupujezopazojuwoti.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/zikozinitipodizufimasizav.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/2487660846.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/bes076psh5719lrbiedvlqgocr/jegibi.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/40390729991.pdfIn PDF document text
    • http://93564497.com/userfiles/90682393817.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/modosugafuforidedalewetid.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/17894226001.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/34595311082.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210901102255.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/dujunogasiganonifirejo.pdfIn PDF document text
    • http://hrudolf.com/userfiles/febew.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/31016468462.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/matipuleb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pik+show+apk+downloadPDF 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_off0000dbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDA 19380 bytes
SHA-256: a72d851e0b30219d13ea3c4fd5f0b808ddc08292764b7a19bdbd0cad1be58c3c
font_01_sfnt_off00010e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12626 10340 bytes
SHA-256: 4fbf6a242ce551810d0120ab86c0b87c74b12fa7e56f994c176ca4db1934a00e