Malicious PDF — malware analysis report

Static analysis result for SHA-256 057d7d5f41d731ba…

MALICIOUS

PDF

82.9 KB Created: 2021-08-17 17:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec283afa8dda865b28656197896b8f48 SHA-1: 5fa487e324bf4ec0624a5155a4caa3590df1d24e SHA-256: 057d7d5f41d731ba4a6620a1d5e9afc7bcf9f377c1e404b628f67ff22ec70a97
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://drafthe.ru/uplcv?utm_term=material+sisat+segunda+aplicacion+2019+secundaria
    • http://movesearchesuk.com/userfiles/file/toluxarataxafafubabika.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee62611285c---83260346749.pdf
    • http://ankurgroups.com/userfiles/file/megotuj.pdf
    • http://acril.ru/ufiles/files/48283536349.pdf
    • http://phuocthuan.vn/images/pic/file/19636888036.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b7e8e5e60---53333600307.pdf
    • http://vinhthuan.com/upload/files/jexofafox.pdf
    • https://lotteppta.com/beta/assets/file/majosokowelimemijofanoz.pdf
    • http://younewstoday.com/task/userimages/file/manodavibizavi.pdf
    • http://aaaexpressac.com/userfiles/file/94961532508.pdf
    • http://lineshare.net/upload/files/20210706082639.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9c07c38d3bef11477ff8cc24e9bc196/24973303644.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/52slaral6amv3ee2sff87kbssd/jinugasa.pdf
    • https://euforbiabulgaria.com/uploads/pages/files/60204294521.pdf
    • https://bselink.com/userfiles/file/munupufabut.pdf
    • http://domainecomps.com/documents/files/67345041949.pdf
    • http://campfirewtx.org/userfiles/file/lunalafugi.pdf
    • http://poorclarescork.ie/images/bibawareriviravanojojog.pdf
    • http://bm-shower.com/userfiles/files/velikaxozadajiw.pdf
    • https://unicorn.mn/js/ckfinder/userfiles/files/41982461047.pdf
    • http://sanruou.com/app/webroot/uploads/files/puwedaxufofixixovumikunem.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/82177e84d08186da4e79cb704e39d6d6/10843196396.pdf
    • http://malagi.pl/user-files/fck/file/7628259172.pdf
    • http://bafiti.com/sklep/userfiles/file/40882867427.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dadf.bin
1ef600d4a5e5bd8beab0733f09d4a0d12224d6a48b9e2e5c4ed0d33fbbd7185e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDADF 11244 bytes
font_01_sfnt_off0000f534.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 16792 bytes
font_02_sfnt_off00010d46.bin
273330f789810f317f2d6b0211aea815d8c38461edb900f5c4a8e33a63717a67
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D46 17972 bytes