Malicious PDF — malware analysis report

Static analysis result for SHA-256 7814342bfe51d54b…

MALICIOUS

PDF

83.1 KB Created: 2021-06-28 08:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: edcacbc47453cb9394eafa610dffe9af SHA-1: 2f9a7dd5ad8eef893a351d746fc6c49cbb7e72dd SHA-256: 7814342bfe51d54b897b28d97db96208c0b409affae417472b1fbce18335ea29
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing form upload plugins. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to lure users to potentially compromised or malicious hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c442cd7e32e---pinaxutikexamezuraju.pdf In PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608676f394f7f---fusarizafonus.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/toxogejofomeguvojakopu.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/0214beb5c2a49f324afc95d5accf215d/nopen.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/9mdnv5lmt928ht6c2u6jkgq51p/zunemagirekes.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/bekaketuvotajewenemevoti.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f167dd691---kewudinuwipa.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bd4cae5d95c---godunedozuwakim.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160d708509c714---89025381940.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/pifepumogu.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/92672882152.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1453fe5952---radarut.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5ed09e67a---xusuvalijinefesovafi.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160984fa76f256---wopamakewufexabo.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609e33afa0882---36208374465.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd28c07eaa9---filupakekovaxeluf.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a39c2883e3b---fopukasapukexi.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792ba52901b---xasixexuzidesa.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/36103867719.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/meponokoxuxetupitunase.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bed694c4005---21863958369.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/bb8982420b5814c2ed08bca55675e2de/vevobubusoxalizosexudo.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/69467579999.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/0eac31efefb63b26e8ae42bb19abd3c6/sotujogoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=tuesday+21+may+2019+maths+paper+answersPDF 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_off0000dc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC92 18260 bytes
SHA-256: 95374e809a102910dbfe3f2a8957d104990eb70541647f21e8500ac066630af9
font_01_sfnt_off00010cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DE 11124 bytes
SHA-256: a907455b6d37c6fab69691ad3d6102a5f6957819713ba82fd970374e0fff5662

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