Malicious PDF — malware analysis report

Static analysis result for SHA-256 5596720aa0d40721…

MALICIOUS

PDF

72.7 KB Created: 2021-09-20 13:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f92e8a1f9d0c912e198780e3bda7779 SHA-1: b68d7be473f884e21e01150d558989785a9e1ae1 SHA-256: 5596720aa0d4072192e5a511d77870c78275d741250dbf6b9180d04684287d86
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics identified the document as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution scheme. The embedded URLs, particularly those hosted on compromised sites, are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d6dd026a---wakaverosogulage.pdf In PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/24561660156.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/26882383629.pdfIn PDF document text
    • http://babamoleskine.com/files/file/88505737834.pdfIn PDF document text
    • http://fourfoods.com/images/files/fijejoj.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/kelokiroki.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/gedogifufaxus.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/jesikatokiwezopuzegub.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16145018368f03---25477284063.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/93765998775.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/wuxududeragukorowinejopuj.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/rejusigu.pdfIn PDF document text
    • http://consade.com/userfiles/file/jikubutavogalurizajama.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/kirivawulatolavarubadoz.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/mevegimewexovoz.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/26290772833.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614146305b9d7---10214744921.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/nekoxajodutimewopajabaxol.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140eae38c132---bodaxodosun.pdfIn PDF document text
    • http://teakdeck.pl/files/file/dagusisiboworonizozezowep.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/pomutokavod.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/8683825512.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/madolugerabejiditudimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=osi+model+pptPDF 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_off0000bd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0A 10212 bytes
SHA-256: 068672c59c54c69eb6ba043be3b8ed21ec9d2494b7ea3c9e503649d3fb3ccd8c
font_01_sfnt_off0000d3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E7 16120 bytes
SHA-256: 9544ec5106106c645b46b8a436b2190c73cb8d535ba94d2fb1ecfe9a76dd8425
font_02_sfnt_off0000fd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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