Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c1ca4422b85bcb…

MALICIOUS

PDF

82.5 KB Created: 2021-09-22 21:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c5a7797b89d16a861c5cb52b33bb4154 SHA-1: ab5ca8d2587858fb3433c94e9c5caac908f18b09 SHA-256: 28c1ca4422b85bcb3c91e170a1307931b6196f0cd31ccc6f7c3994274d5398f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a URL with 'download windows loader' in its query parameter strongly indicate a lure for malicious software. Although no scripts were explicitly extracted, the nature of the links and the ML classifier's high confidence score suggest it's designed to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=download+windows+loader+extreme+windows+7 PDF link annotation
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16144927037d69---61375829095.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/82826442920.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/70592878987.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/duridamaduwudetokididejom.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146e41142365---teturadurefobobosa.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/1214784734.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/12489642137.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/fazorokixojumagavixojotax.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/77231172611.pdfIn PDF document text
    • http://tai-group.com/upload/files/43876028237.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/lelomujabagetiwu.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/rubaxobixevulujebokogov.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109051736204484.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/faabd6d5e7a94219476fa4c45ec25ba1/zapelimikebi.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/31744043110.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109032228572412.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/bexoxowebipekenuto.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/77995643110.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/87642937948.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/96050722587.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/4404155921.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/94068670324.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/suwado.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_off0000e025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE025 10648 bytes
SHA-256: 05eb1db6b88cb1f7406450c2a81f67ce345c35825ad01d70cb405c9a5d65fb46
font_01_sfnt_off0000f8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 16928 bytes
SHA-256: d14884b2b337bef5b52a469ea1ea46e8ee390e06d76eba5976204cbcdaf51975

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