Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d51996a9f32792…

MALICIOUS

PDF

88.0 KB Created: 2021-09-19 10:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 573e58dcb4ac40d0cb8529e5a9413ebd SHA-1: 24acb4b885e17e91a325aaaec6e507c31455194f SHA-256: d4d51996a9f32792851ec357d92ea11398b1e66338178b3b40a47f842c44df1e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/24ff58946574450c4c01281bd6aa6c17/bevekuvuziwiromulosupabej.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/95418620420.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/31317527086.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/32071392600.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/81496367325.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/sozanufifuzobib.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/21064156135.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/82280319383.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/notifupuzimuzidonujenijov.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/763ba099b8ab48e631b26d1e4cbb729f/24357681836.pdfIn PDF document text
    • http://szm.hu/userfiles/file/kuvigoxuxe.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/xipudedanazegif.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/30840864307.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/rorogarabuvuni.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/fowiwav.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/23776437299.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16130d069b6b67---99374674113.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/79366500624.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/60000539596.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/runisiko.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1614137c739118---79568989272.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/memujovamakuwolagomidus.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/gowujotakomojafu.pdfIn PDF document text
    • http://thegioioto.store/upload/files/9242595711.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/wipoponodelukexegedopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=avatar+last+airbender+free+streamPDF 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_off0000ef58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001076a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 19504 bytes
SHA-256: 4e86e2019d04e2005de070a05f36bbb8f3e8740900c3285ec458733645b241a0
font_02_sfnt_off00013a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0B 10584 bytes
SHA-256: 2c5e2e589914e8d99f06444346153f778de9b35f8c732e6bbf5b926d9314891d