Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09b14a61d139818…

MALICIOUS

PDF

73.3 KB Created: 2021-07-01 11:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8acef19503b17d9ea14507661583649f SHA-1: 7faf35fa1b73640f7c39165cf1b1f17fc1af0a08 SHA-256: b09b14a61d1398189d7496e865c714a8ac83dc2c87c2cfe0a52f8e31ed50fc0a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate that the document is part of a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malware or phishing content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857c3b47ec4---56499971911.pdf
    • http://normel.org/files/upload/file/84338088201.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/71950c20c63eba951bce4d53e1d63960/98903503953.pdf
    • http://watdoenwevandaag.nl/upload/39698631259.pdf
    • https://pet-fashion.ro/mm/file/sisisipijovivixofelat.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/3c7c209fa59d206cd28d47360fc13d93/nemez.pdf
    • https://octvads.site/js/ckfinder/userfiles/files/loviwolejodepuzirator.pdf
    • http://patronusalapitvany.hu/public_html/upload/31109849683.pdf
    • http://z-i-f.ru/userfiles/file/72494761760.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/6cucvs106h8irq2o0jj96u236m/rixebodusekoxexotajonuwak.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26549bdd9e---2472733747.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947d881defd---31471913918.pdf
    • http://fobosgrunt.ru/files/ckfinder/files/53716556142.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/qjso1dg6cmudiov2p7jq0eqb0v/61489492790.pdf
    • http://ufnk.fr/app/webroot/files/file/gatumides.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd49db211---vonewenomiluwatanubod.pdf
    • https://advance-pack.com/editor_upload/file/jemimuloji.pdf
    • http://ciaooo.ru/uploades/userfiles/file/24927481431.pdf
    • http://nuestratierrapremios.com/campannas/file/37219242389.pdf
    • https://yz-yongzhong.com/upfiles/editor/files/duxekibimeberefetamebef.pdf
    • http://diclenakliyat.com/userfiles/file/50710018938.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/5057cb6107f40aebeef4b93a5312c32f/benubigedaborazodenulatid.pdf
    • https://arab-hams.com/Ups/files/61788883988.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=g+on+piano+note
    • 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_off0000bf59.bin
d5de6690aa2ed051bb8adbf6f3c417f07e5766a34de0fa9f03dcca1905b69f77
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF59 16316 bytes
font_01_sfnt_off0000e9c0.bin
605f821668ace4f16abacde4375e1e2c74d2c2bc2b3465f1c21958778efc9f52
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C0 9972 bytes
font_02_sfnt_off0000fff9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 16792 bytes