Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b88fd5610908fec…

MALICIOUS

PDF

163.8 KB Created: 2021-07-18 06:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 44dd6e5ac5e94c1262c18b66a09d13fc SHA-1: 1e3f13f31c9c9f7ab5886de98c1b5e1ea1bb404f SHA-256: 2b88fd5610908fecd10ebcf534b1a9bc3d52b1e17cc097d4d3be09073c929991
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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 http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d52770163f5877bc6567e0cf2f12d1ba/39235479243.pdf In PDF document text
    • https://nabsangram.com/userfiles/file/pigezudejelerubupod.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/78332283858.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f531c5904---walebagowirutu.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/r9q7mc9ba259k9eanpkv8hmov4/2656382105.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/bojukufavulovupeta.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/zapiposegakanunetuzumudi.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/a80da20e0cf4b5ce5bdfb27f8bd1b2d8/42972478188.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160832b0a1b9dc---96771543585.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/zoxajoko.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/50991937328.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/femefinuzujuxukenubopub.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080e9c7d2252---70291234397.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/a73cda82cdabd1b9a3da27b301fcb5b5/mafasurifarutanezibaf.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/22427628385.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a4fb9652d79c7e89f6278fbf0767e78f/81609170422.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608270fa67846---zenurorikuvidirewa.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb12d9469d9---82877931104.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/55744700135.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/b4801ae7bc97c4b9647fd998cfb36b6b/93095445179.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/29965379596.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/9392c36bd4eec963a1507817346073c6/8263546787.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b59fd7a2e23---sujowozovapujaxer.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/kekuzoritiwawowokumovuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+ideology+of+india%27s+modern+rightPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000200f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x200F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00021903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21903 18056 bytes
SHA-256: 763091a1cd4dc55378caaeb684490f5b6ac78dd569ce3a399cc8f7baad2277c0
font_02_sfnt_off0002355a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2355A 19292 bytes
SHA-256: f0f5e94b6991dbbfae54c954f08225c01b846c87fe9c7bc21fb9a46be6f9232e
font_03_sfnt_off00026669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26669 10912 bytes
SHA-256: 9fe50a7e2b0bc3986b82cecf52dd3563d883412389ed637ad7d71f99e6751097

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