Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad99fe5aa2a07b6…

MALICIOUS

PDF

80.2 KB Created: 2021-08-10 03:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba0007e76add39805495c42b42ea700a SHA-1: f926b669c1bb187b34e382325113f96a3f2dc996 SHA-256: aad99fe5aa2a07b6b963a91e346caeda30589f8af315b15b7f72bb7e2077e84b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

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 https://pixomot.ru/uplcv?utm_term=phrasal+verbs+separable+and+inseparable+exercises+pdf
    • http://nowyhotelik.pl/userfiles/file/pabojituwarufoselevesinux.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/33b74ca3d8221d804830a8bf8eb6e9ba/tunepakitijijafiluranor.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608af2d48da15---47868724129.pdf
    • https://doublehair.center/upload/ckfinder/files/vifebawepowozoz.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160928aa40ff8d---jefokiwobexawemosox.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/ladiruroxobur.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/648212755da3c52fd67d8e08b9a2a35b/52409032524.pdf
    • http://transcash.com/ci/userfiles/files/litidawosejedag.pdf
    • https://eurotechcorp.vn/admin/webroot/upload/image/files/90980556192.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/fed89eb721a943dc1e7372674a35fd19/24418498417.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070df5990502---45661012316.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160780d27f416f---luzevapom.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/e01b42269ad3d91759e6c406db3423df/20338946249.pdf
    • https://alutat.com/data/file/xanapuna.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b58878431---78239135492.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e49c658802---rumelijid.pdf
    • http://learnersdigest.org/userfiles/file/44111898915.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f6b22ca6ef1ca38305099c1f80ae2d09/fofenenelapela.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e5jc133aj4s0um5ud6rga6o9j/loxifuzowogubimawujoxaj.pdf
    • https://girilawfirm.com/content_files/files/vebaxatuwelotuveze.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/7f4c6d47d05f72feee696836371383ab/26354987357.pdf
    • https://paklya.su/design/img/upload/file/73544735580.pdf
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rewivi.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_off0000d582.bin
3162357389803b4003845a449b94ca97f554119cef0d7c235a04ecacf0e875f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD582 10808 bytes
font_01_sfnt_off0000ee1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1F 16792 bytes
font_02_sfnt_off00010631.bin
859226a3dc44da9097352d3f4c05b99ad3ddc1dcc89a75cc2844ea003b0720a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10631 16356 bytes