Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce658af688643cf…

MALICIOUS

PDF

78.2 KB Created: 2021-09-21 06:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7944fdbc9b23ead56267396d77c48ea4 SHA-1: 38c0ca65919b929cff9827ea31087e41e567a60f SHA-256: fce658af688643cf9c4585bf0fdfa5e5ad4cb024925557399ed6fac2a82b7e56
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The presence of multiple external URIs and the nature of the hosting suggest a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://wastran.ru/uplcv?utm_term=how+to+turn+off+location+tracking+on+android PDF link annotation
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/d0b46887ffeecff85b363aa1696b3c6e/kikawomosafejal.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/850b43d5b2db294dc93d63fda63d6bd1/80044219060.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/91154017562.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/13036949665.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/gebomosof.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/lidagogupew.pdfIn PDF document text
    • https://ckmandarin.com/uploads/36981926491.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/darukilubawobakebo.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/nomokonuk.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/81817617400.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/85952569163.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/raporobidawuwekutujo.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/pamozogosofajodesogixoxa.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/supifop.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/gatakesiwogixopoxerebe.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/32023487520.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/86653432020.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/warenewozonuvetipobi.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/redixirupaxi.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613f726e5bb12---sesagidiraf.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/supanajijuzexadif.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476a308485e---fixonivumiminekufajuzel.pdfIn PDF document text
    • http://healthywithhart.com/res/file/dowubefoterewufif.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69979953082.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/5b44f9ac3b11f683e495c458423551f7/85953929737.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_off0000cf24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73B 10620 bytes
SHA-256: 4e1592188984cf0b834f4047bb51304886891db68d09d8393f40e885220653f3
font_02_sfnt_off0000ff67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF67 16848 bytes
SHA-256: ba06c99ffb6f1607aec1236557333c02ea6dc63f751343caa9f692ef47821e82

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