Malicious PDF — malware analysis report

Static analysis result for SHA-256 231dbc00b7579a38…

MALICIOUS

PDF

117.8 KB Created: 2021-07-26 00:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 50eeee25cb530582c930105647287d75 SHA-1: a241d0f79af714c1dfd6304a6bcfc55a664f19f0 SHA-256: 231dbc00b7579a38326da424f21dfd8bcc3599aeedef422ee6ea20a206c38bc0
164 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload. The presence of a 'download button' heuristic further supports this lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bustotoronto.com/userfiles/file/mebakanowoboboneli.pdf In PDF document text
    • http://voszveszprem.hu/_user/file/25197661995.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/87339171071.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/97126856691.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/7747e12102294b02b363f387a8fa822d/4806711492.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/liwawiz.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021051708592171.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160952e40249d1---87150588675.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16092452848e28---16184303355.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/ririzuwezozopirimuga.pdfIn PDF document text
    • http://strap.sk/uploads/files/pukop.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/27870866343.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/wuzemilatexobemuwi.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16081909964a02---68416418928.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd28b233bf---xatimodugevirezetog.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/redotumesekekepelukosiwob.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/31548758988.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/su0vpbvftehesmb1sqako5u86u/31038033626.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ea3b98ef5---dageluzexefodusudebav.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077efe05f6c0---xiwijenegaporemoxemila.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d399a0c9e---votudaxisiwelovevita.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0183997d9d---24784101202.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/97736020849.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/wovuj.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094afc1d8622---gadaboxuwibisox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=tanki+online+crystal+generator+2019+no+human+verificationPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00015429.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15429 20044 bytes
SHA-256: f2e84db1143ca003558253279f1e31367454a72ecea033809f2c382d657a289e
font_00_sfnt_off00013c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001763f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1763F 11580 bytes
SHA-256: baeba1ced36ac599f4f505a9188b81ed190f8c128157905d23bc72c9ac8e470e
font_03_sfnt_off000191c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191C6 21460 bytes
SHA-256: 146b66e7a3362ffb2c2db2a8c98513d7baeb58b8b7be2e8c3c41d78dd37af04d

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