Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea1369af68e03e2c…

MALICIOUS

PDF

85.6 KB Created: 2021-08-22 04:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d4097452b077895545617a1c33bf5f9 SHA-1: cd8ca992e356ceca29ffdddf4c6fe44af1934dab SHA-256: ea1369af68e03e2c1be6ab8e82bdd981f4b04fba71e27c602978ec261862cad6
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to a link farm hosted on various domains, some of which appear to be compromised WordPress sites. This suggests the document's primary purpose is to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://smidgel.ru/uplcv?utm_term=los+nombres+de+dios+segun+la+biblia+reina+valera PDF link annotation
    • http://rolmech-strzelno.pl/Upload/file/refazalosiw.pdfIn PDF document text
    • http://gewald.ru/content/Files/gujojekafobetukajovudopi.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/40705536464.pdfIn PDF document text
    • https://proxus.nl/file/ziwolow.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/tezelaxuduvaxuvunu.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/42681940018.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/5d1c29123ebacd17571d215cf005a4de/fagabadetujasujazopef.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106241542271129.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/70297167465.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/gapojadejikados.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f9f686a31c22fe945d70b5c8fca6a25c/dagosebagijebopoxutibok.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21e2c85602---92839295949.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/kanizonukomenuf.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37c275fc8---45463987222.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/6644714581.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828cea65c90---tawubidoniveroze.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/riwelefatexodibadumavepu.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1079612228610468e67804e.pdfIn PDF document text
    • http://haphadoor.com/upload/files/80051520748.pdfIn PDF document text
    • https://ubranni.com/uploader/files/89730474433.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/hmgsth3u3dfom4gralub0h60p6/bisuruvekilen.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/oq1b9t30pdcibq2bcj2njobs06/tijuzilusilipesopufeba.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/3n9pvi5q4ncp7amgf484055bct/rujinatokotezaxunowitexi.pdfIn 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_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 10756 bytes
SHA-256: 09a7e348cd6fc6fee7cf3b2a60d9329f8f7e16fd6cdce98ee43e160690702f46
font_01_sfnt_off0000ff26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11738 18424 bytes
SHA-256: 5ac946d5a6d899fce0dc39567ce1aa2c80145ee5f7e1c99b1b79968ae53fae7f

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