Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41549cc3dcf703f…

MALICIOUS

PDF

76.0 KB Created: 2021-07-05 06:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-07-13
MD5: 0add203412ed45ae06ef58ff26719ad1 SHA-1: b34fd8a515363fe3ac1d0de705c2465ccbcf3242 SHA-256: b41549cc3dcf703f2db4008256d4bbbc86a2397477797d5d4145bdd4b1c2425d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The file's structure and the presence of multiple external URIs strongly suggest an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://aimara-bg.com/userfiles/file/11546806097.pdf In PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4f842ab3e8eb392a9400b126d2645710/kowaxezevaposutabetulis.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ca6b37e3f---72578712824.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702daa0bfde---jesosulokoneti.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/pajenebizapite.pdfIn PDF document text
    • http://packturf.fr/files/kusimisezu.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/81c324f439761008b5a57c9e82741542/48789934366.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160983c8a8a51e---bosaparejadepepilopubuxad.pdfIn PDF document text
    • http://bronia.org/userfiles/file/2797372838.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/48403999587.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/036fc81f055c92ff05bc263a11bb136d/41788487737.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/jojodapokibifiremarojubum.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/muzabupexokosuk.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/mulijivarofuxozanid.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/kukifar.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/1504f9b554236f43ab72fbdadfc85e04/51047290057.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/7b363301869dc62fb034920f7d163b86/21347521394.pdfIn PDF document text
    • https://egf.tw/test2/images/file/pewaralunezokakogezi.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/59344618328.pdfIn PDF document text
    • http://erex.hu/upload/file/zejapewedirubogizelujepu.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e256123d784---nebusuzulewazowil.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bbea91c76---32722260347.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/zalatid.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/kojuvuwakuwedixegasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=6+cups+in+litersPDF 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_off0000c712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC712 10256 bytes
SHA-256: 1b0fb3a15fe42c573a65a5a7616daa616a3955e9cc6cc751a7ef1a8ff60c6ed5
font_01_sfnt_off0000de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64C 17224 bytes
SHA-256: 56841f0e46bc61f08ca132a8f3e9c111d511980307c7699908b20f7eb6dd7f52

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