Malicious PDF — malware analysis report

Static analysis result for SHA-256 f064f88d5cc34942…

MALICIOUS

PDF

87.6 KB Created: 2021-07-18 10:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 25bfc4dba94d90d467269b849ff74bae SHA-1: 32572a722b862286dbf1c19f35753ef2c2f03949 SHA-256: f064f88d5cc349429ee63a8c6ad596f6cbf70ac9d338770e7ae22296220bc6d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF that contains numerous links to external resources, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content. The presence of link farms on disposable hosting and compromised CMS upload directories suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8a0df005f---kagotiluviduxoguti.pdf In PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/sovebufunakagonagew.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/wolonitawifefegilifigo.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/6196601908.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883c03b6c55---75865231718.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/59d159c4489b37cb1fd7e0f0bad9ca4c/3464950784.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608769448d7e0---51094188684.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/jrn6h4vivukajfnvohec2vspa0/duxogorobakizujugep.pdfIn PDF document text
    • https://projetovm.com/uploads/files/jikobujedugesudap.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/1dcfa2f6b889530d62aa8bf8080b8dd3/26706258555.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/580827076a156c3cefbb967c481ef493/50806135426.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/7tn06v6nh95q7v2fhhapfhb0te/nuligoxaja.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/0d11aiptfcvnp38htrfr9990qo/kufavuri.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/d1591e0f685b1eeb25622cbfdec9e5c9/donubilijadog.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e484a462f---28999947890.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/99720268741.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/154j7bm0j802phinrlcuvliq3j/losematofapudurojab.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/susuvepuzuluvekewaxugore.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/99241738296.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/37001819875.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/towudibezefisoku.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a3bbcc6f6---61507905843.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5e83d8946---lulekamalubezekorawadupe.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/niguniravozusinikegonam.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/ladiwekizebajus.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/d2rpnhld84lqdg501bu7s3gj5b/32509850683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=tribe+of+gad+in+americaPDF link annotation
    • https://medlineplus.gov/anxiety.htmlIn PDF document text
    • 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_off0000f65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65D 16452 bytes
SHA-256: 95036caea90e002a90cf3e753953883e04c1ff4ac9e2fe2e27028efb886c06e6
font_01_sfnt_off00012108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12108 10608 bytes
SHA-256: 3757e50fefee0ca3c7486afd9e05856dd3f1cdcb34087f2803e79a6f81f41c5d
font_02_sfnt_off0001390a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1