Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1df0e8845f1b562…

MALICIOUS

PDF

86.3 KB Created: 2021-07-17 00:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89a2fd8e1f92b723caa94129c47630f5 SHA-1: a2c4b1cb52f29dd08b913ae59f70b950d9ab9f9b SHA-256: e1df0e8845f1b562633678b5643242cc09f168d0a85e9270e6cc0a62212a3682
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm to distribute traffic to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/2e98b3a8f040ad10bf63b8ed4abfdf16/xawatozo.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b127f9ea87afbe73638eb1942a103f57/12754738391.pdf
    • http://berallebags.com/UploadFiles/FCKeditor/20210513023829.pdf
    • http://rafaelokazakov.com/file/golixamiwupedojuveguluf.pdf
    • https://privatecambodiatour.com/userfiles/file/91015194186.pdf
    • http://marty-triple-m.ch/inhalt/files/xirodopexaganid.pdf
    • http://baovevietnam-vnss.com/upload/file/79916076717.pdf
    • https://topupdana.com/contents//files/zurogifisoroli.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/9f0e9083e96c7029bfcf57a0db490c21/22723321225.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/b3898cd9b9c3bd89dd374b5995d2136e/15529702619.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b567a92383c---nigexowugotimitijeza.pdf
    • http://transbur.ru/admin/ckfinder/userfiles/files/xupilomonusavuzo.pdf
    • https://hoalavender.net/upload/files/58291255206.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4500ae6b8e4e6b59885c7722e556fd23/xaduvadolevonup.pdf
    • https://soft-print.pl/app/webroot/media/files/8809847330.pdf
    • http://swiss-ex.com/sepiwufifozezufigosufasu.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085b94404782---85591561561.pdf
    • http://nagymester.com/userfiles/file/43645766084.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/54c1194d6eb9e67a664e69b5b545c32e/27594080369.pdf
    • https://sanidom.pl/img/file/29283375806.pdf
    • https://tort-art.ru/userfiles/file/5705188069.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b57629a2453---30748470037.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/dd1c1a73f5a1bddc4ceb4cf6d6369a1b/saxuxon.pdf
    • http://chelseafoodmart.com/uploads/files/liwakivobom.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=alison+brie+golden+globes
    • 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_off0000ef7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7E 16792 bytes
font_01_sfnt_off00010795.bin
36f9db67d2a10f41c021ace079cf946ef6fb93a1db206e8b2b33e20b297db84a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10795 10284 bytes
font_02_sfnt_off00011e8e.bin
5e8a75549f382773ef6d38dbd9eee5ce2ef5d119c66ce8ef6843781e044d4b87
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8E 17448 bytes