Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd6ab781f07d811…

MALICIOUS

PDF

82.8 KB Created: 2021-09-09 18:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f939f2c3c536ac30922acda04618581b SHA-1: cf76a44eecb2c658c48e3937f46ab5fc14ca9485 SHA-256: 9bd6ab781f07d811736f934103149a4e5b4bf65098f302cbc93b9265484f82d3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a link farm pointing to numerous disposable domains and compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farm structures indicates a likely intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://moje-stranky.eu/userfiles/file/30500982504.pdf In PDF document text
    • http://vinhthuan.vn/upload/files/wekimatiripijurumazuj.pdfIn PDF document text
    • http://tion.hu/upload/file/pazorigebajusazaz.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/53741226120.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/92828428215.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/86896275640.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/nusazedojebomibasofiton.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/14816301968.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/813f92269d5138b4a755f0e858fbe265.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/nexini.pdfIn PDF document text
    • http://slovoveri.org/userfiles/93698086013.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210903080847.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136347fa0c46---52117888790.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/79643915576.pdfIn PDF document text
    • https://cityface.cz/res/file/wonerisebakigodifugijuku.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/lanalazulotoxizuzam.pdfIn PDF document text
    • http://runo34.ru/attachments/file/nejolevapojedujesifalonov.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/96665302160.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/2e4bc36fafd45fa030e48130dbe4925e/60588693640.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613683b97146c---xusebutubanudibitu.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/97158895553.pdfIn PDF document text
    • http://marketingnews.fr/images/file/78493347800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=powerdirector+hacked+versionPDF 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_off0000ddb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB1 10664 bytes
SHA-256: 789f186440563ff94fc5bf599e24f03e9ee25993183559531f157871ea10645a
font_01_sfnt_off0000f62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62D 18252 bytes
SHA-256: 57a56572bf6b89aab2f87b25f638a6b8f76009db1b33e09fb9087a099b595e32
font_02_sfnt_off00012573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1