Malicious PDF — malware analysis report

Static analysis result for SHA-256 5783e4d4c13fec11…

MALICIOUS

PDF

125.6 KB Created: 2021-06-25 12:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 96e42f4db867e81776cabcc868895e61 SHA-1: 6658fc3e886e457fc5db1becdd92a5981bf72a7a SHA-256: 5783e4d4c13fec11ba433eb439c4434daacd5a0d42a5d6835bd74ba0e86d6ffe
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malicious link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to external malicious sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/gsj051mflp9fclmbr4stj5rmvr/98245467178.pdf In PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ea444dd4a---59676935610.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210611065226_d9cr6a.pdfIn PDF document text
    • http://www.heksan.com.pl/file/rikuzadezuwineko.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ncvo9s3cd8kt5gep0b2tlqmta4/fipatujotixekebavuwibo.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608528975f7a5---60394488882.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/vifujofope.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ti45blnur2s1k71oho7jjorios/foseparijijol.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/d9c84bf4e23303c00eaed2583442027f/37791756978.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/pbek2kc7dbg8nii6et726fhti2/43633047295.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/56218841353.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160769487475aa---tedobi.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/guniwoba.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/kaxososinojalusine.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dbfe3ce5b---bobajutineg.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/gukura.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/d9b2275a6846914e1fff2974339146e5/16506145435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=probability+and+stochastic+processes+yates+3rd+edition+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000174d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174D6 20720 bytes
SHA-256: 4027f2378892e813a2e699e661355ba016ba981d0d309a89da6ad593e28c7b9a
font_01_sfnt_off0001ad88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD88 11144 bytes
SHA-256: 9590c6bc5bfa6b729eaa36882f93a6a11c9244a7b59c7b3dfc6dc21ffab8df19
font_02_sfnt_off0001c71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C71A 1864 bytes
SHA-256: 2c0c516566c781a3d56a51f0e8eb828ee9a9099092e7b9ddf4647adbb25d89d9
font_03_sfnt_off0001d07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D07B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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