Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b838dd82a504379…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 01:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5b642163edcee224f25ec14fdbb7b699 SHA-1: d19edf3f260e504d06965404760acd02f5dfc47f SHA-256: 9b838dd82a504379521715b44e03a214619b183f248b7b616e42616cfb023460
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic firings indicate this PDF is a link farm designed to redirect users, likely to phishing sites or to download further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=salt+and+sanctuary+bag+of+earth PDF link annotation
    • https://dailyhondaotomientay.com/upload/files/vepubinodupetukebusutowo.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210627_326D3F4BD026B388.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/4183516725.pdfIn PDF document text
    • http://usateatop.com/_upload/files/53555476089.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-8-5/20210805043740314119.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zixigidozetodedev.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/58935591986.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080124096de3---malafelozolex.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/c75c05749a64456f7444bc8b07725874/93591131518.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/5561c158a90a143493bc46ce35605042/59931427174.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b3f696c4b---78601912284.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/kebapizuxenuwimazana.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920ddf5fb00---23841634009.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/xigusexapewibelafikejamo.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/zawajanediruvoxeluwinofu.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb229b64ceb---94592115659.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3854dfa0d---pudawubedufuwarakagaju.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/98435177652.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/tefakekidive.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/07/27/sefizifefelox.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/7e27fb470f3b1d92ea0cdcc43b84c798/pewudalesapos.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc9de2c742---79120753427.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940990abeae---dozasadur.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/01d4c251f793cfbd893a4651fefe669c/zanekugixuzepulofuro.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2ae3664ea---23027348209.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_off0000db45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB45 11092 bytes
SHA-256: eb87e34553e9327c6ed5cd32f921e3f51c9c9fa86b1653982302fe0dcc7a4bae
font_01_sfnt_off0000f4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EA 18932 bytes
SHA-256: d5022755b231792ab70067bf858e7dbd6aa2ebb2ec54c9bfcc9624c6d4bc7ff7
font_02_sfnt_off00012690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1