Malicious PDF — malware analysis report

Static analysis result for SHA-256 e32f2e2041c73d24…

MALICIOUS

PDF

87.7 KB Created: 2021-06-26 09:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6c8303781d3e7b9944c428e7b0dcd489 SHA-1: 47564cdac837152ccfa8ca69e7ab91e957ec46b9 SHA-256: e32f2e2041c73d24b487a648cabaa729f99d03784a51d5cdf0660f3dd88bda83
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. The document body is unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://krisoc.ru/uplcv?utm_term=davido+are+you+done+talking PDF link annotation
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/f13il9q7e66gmmil78jnvfcaf1/geseberiba.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-8/20210508210905344319.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/6pk5u6qelafngef8kl69f8a5hi/vetidus.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160987bd8d4ca1---diwizuli.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/gimerawi.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/f7b5d245ebbe7bcfd21cfc2fa48cfdac/pedubenavuwepakedekute.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ghq76brs49254g3n6fkclo6ug3/kolozubowezanejawisug.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/metubedotijodugurobi.pdfIn PDF document text
    • http://hasyo.net/files/file/2219062422.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/e99a464cf36d55955cffb69a222fe455/jadufadovuretejudubi.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/ropugafejukugufifedimakor.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/vediwab.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/e7e1948e492fcb2612355cc1388a2267/nazepesuzed.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/zatujaxalabavijefimuma.pdfIn PDF document text
    • http://webursitet.org/Files/file/48585483818.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9d3e115d7---banamajamodelesopi.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3c81d100e---52938116604.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/wezedufakekasixepelulu.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/57947419596.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c305ddaebf8---22934988389.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/67666224061.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/e2f1072c506ff44f723e921019850f66/34533758064.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/wedokegikapog.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_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 10628 bytes
SHA-256: 2ec7cd46891d339d0a630844c61568f13c4dffce5d2b1d15b0d01fbc6f1913c8
font_02_sfnt_off00012323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12323 17348 bytes
SHA-256: 3466a341ce6d132f3e202e75c456921b16dc57464def7fa2ec79a79efbbf24c2

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