Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52e1e2b32172649…

MALICIOUS

PDF

95.9 KB Created: 2021-07-17 16:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e901a525e00450479682b05aac00dd8d SHA-1: 6d88a0cc1ddc95894b7e52b8fe7d2eee863cb042 SHA-256: f52e1e2b32172649420f4eaa7f40c802a43ae5b7900419e0572323968026a089
156 Risk Score

Malware Insights

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

The sample was detected by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of multiple PDF link farm heuristics indicates an attempt to direct users to potentially malicious or compromised external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/0246fe27b82c055cef4f1e307a11a940/xaxesom.pdf In PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086549b6b297---losevebeferolovifix.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/mg2di9610gt0hu6sfs8shrtcs5/gasixanenoliwopupama.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9ea55befb---95032084678.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deefc0a26e2---17370147812.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/55bfbaf6b8eccd6abb0a58610e46fddc/diwunetebe.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/simuroxemanomamepekozugud.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/rirexugadojigi.pdfIn PDF document text
    • https://invest.pl/userfiles/file/jofonetiboko.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/fezuwezazerofu.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021060220005989.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/noxanufaxedopojudigebugog.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/qdq4i1ks4js4uuhmi1encdv371/56707116139.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/kimazogigozakifoxenigutov.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/cf059cfcd760fc04e6d9501bf03f4a14/vojemig.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/ca22e60be529a1726d54e53e591e7c6b/mopukeduvuwezezufatikifi.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/3815f5793b24d6fd614ff0452c248284/fiwuduke.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/rc0q8ptvphct9s4c4ql732tih7/22560054832.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5396fd579d3682aa1943a30eb5964498/zazikizabupa.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/38897369329.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/rulekasosepirexijimed.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210717_AA72D9229D57AB1E.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=funny+riddles+for+teachers+with+answersPDF link annotation
    • 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_off0001156e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156E 16944 bytes
SHA-256: ed2acc7413ce551de53945b7545c4a0e1912d950097391e9dd3c750de9b6ff6a
font_01_sfnt_off0001412e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412E 10848 bytes
SHA-256: 4f3d8e4040599aa71610259ab9b4dd335bc22a9a657808f61fea0743632b8c73
font_02_sfnt_off00015a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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