Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e924ad83550cbd4…

MALICIOUS

PDF

68.3 KB Created: 2021-09-28 01:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e4575ff01c5fba8a52246eb7a3519ec8 SHA-1: 647b42c7a635ef57404ab4156d2ff999d2ebf39b SHA-256: 8e924ad83550cbd4350b516d5df7264321a1627471982d02e35023aed06719f5
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The document body was unreadable, but the presence of numerous external links strongly suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://cioccolatogallucci.it/userfiles/file/72753969016.pdf In PDF document text
    • http://klccpa.com/userfiles/file/pepuvafifovizuv.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/67145983252.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c10320962d---90519610065.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/50985875923.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2b3561ac6---rufilukafiviboxibifiletam.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/89551474585.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/jikuliv.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/73404434819.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/56136624224.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210901_090519.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2d3b90e84---bekifuzasolexune.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/18621454201.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/dewego.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc3589c888---28195165647.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/bs3oo9lkss2g9dottta660orf0/jesitamatulosawekafuxiri.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/kamojuxakijusirukagawi.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/valazonolaxigagedav.pdfIn PDF document text
    • https://slotsonline.ro/app/webroot/files/userfiles/files/tamosixinebubu.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/sovon.pdfIn PDF document text
    • http://patroha.hu/file/6879182220.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0218409fc---ranudavuzibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=renpho+scale+app+androidPDF 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_off0000add7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E9 15328 bytes
SHA-256: 49abf9339c8081f011632f68a318fb600d159bd9e0c42e857514798027a363ab
font_02_sfnt_off0000ebf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 10556 bytes
SHA-256: 4e2541c6315c5120a2daca1301cadba46402741c51b2cdfddf72d3f826138af0

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