Malicious PDF — malware analysis report

Static analysis result for SHA-256 df37446e1bb8f56f…

MALICIOUS

PDF

74.9 KB Created: 2021-06-25 19:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e06345d6c4bec7036bc434cace518dc4 SHA-1: 937ab3652523461eee753917f7d4344f989239d8 SHA-256: df37446e1bb8f56f4bf5fa3bce300b74f4fe6765dd0801fa8cb53dcd94b14d32
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple link farm heuristics reinforces this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://dyglas.com/userData/board/file/bewun.pdf In PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/89033606878.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/tekureseme.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/47fae423fc71bc1f01470b75ac392d28/zukepegirewogoloburo.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/251484530939c80acd1a5df42a36d01a/68492664618.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b431d98e3---jabubetejotojuj.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/126a3eb1cf50d9447fd0e50de26bdf96/gobujut.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/21470255136.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/jokojuwemosawetobaris.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/cf170a13b80a4da18d49eea9e0856eda/rowebipogitez.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/fomikosujafixokekamef.pdfIn PDF document text
    • http://unityproductions.com/upload/files/18751991742.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d8dfba74d---vitumovomudojomamolufala.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/savaselalulejoraxozikuxe.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/988ee37540cd0c634c8a1f1f4d446b6c/75545704867.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/4250159181.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7b186e111fd85dc6e917b31277f4d6a5/73627275635.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/ae75862b53832afdbb3848a43ae7495b/woxosevogosuzofomo.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160796e33bd3a5---52481730655.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/v10ebsben01eahunkatddir500/89918389064.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/tumetufapuwipuwevi.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/ridukikevuvipezebuj.pdfIn PDF document text
    • http://ruihuitax.com/files/file/201667657.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/89096581210.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/50511854942.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607915f038b74---nerokenubufometos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=briggs+and+stratton+quantum+power+4hp+manualPDF 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_off0000bf76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF76 17144 bytes
SHA-256: 99560a6a13760ba30a0bdd49d0d5602fc922693757445a494b3a1bd8975b68dc
font_01_sfnt_off0000ebaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C1 11300 bytes
SHA-256: e0534c6ce7c238877231baa2a6470ba1bb933021527069bfe60657e7ba82e7b7