Malicious PDF — malware analysis report

Static analysis result for SHA-256 201da0dfa896b3bf…

MALICIOUS

PDF

79.3 KB Created: 2021-09-22 11:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: de8d5ab6b20635dfd0bf8bbb2c82c3a5 SHA-1: ce7e217218e4b0c52c0f2ed27d7c9d0a19153eac SHA-256: 201da0dfa896b3bf21ff173ddd29f468db92afcfa062affc5fbcb63e3f582d89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. This suggests an attempt to lure users to external sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://membermimpi.com/contents/files/lulubo.pdf In PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/lifunizaliranevomid.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/xapasasor.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/76822525844.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/4db0ef5bf6aa400d419a5dbd5b1ac8f5/67627796612.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/ruvubupemekun.pdfIn PDF document text
    • https://gangnampools.com/contents/files/davusasejumapenafu.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-8/20210908215308444320.pdfIn PDF document text
    • http://gestioniarmatoriali.it/52855980502.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ec61tkcono580hht16u2n6hiqt/50785944263.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/zuzegumupomakisukor.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/34653940866.pdfIn PDF document text
    • http://dhalahoredeals.com/survey/userfiles/files/86871880278.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614ace047706c---87877450900.pdfIn PDF document text
    • http://millecolori.it/images/file/52056578639.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/nefuxubonane.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/kulavu.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/xokelokezajiwekibo.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/23481315966.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/saxujikasesifap.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/rutijidepibinudumalum.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/60131953985.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/zoniwelulemivafuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=grover+podcast+androidPDF 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_off0000d09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09A 18088 bytes
SHA-256: 9455bf995e1ccd54dafb047a6fde7f4473806590b2e4a3bef9000b92c696d251
font_01_sfnt_off0000ffc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DE 10564 bytes
SHA-256: 07ddbd80cc73806d1ecb5caa7947fce3ea139405c6c95f62c32ca11757dbc937