Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23492889c8892b0…

MALICIOUS

PDF

84.1 KB Created: 2021-09-13 06:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e50de831dc5f27e5c3a5631dd987da16 SHA-1: 7598ecd5ce80de6cb613f42cbbcd90c0b39af44a SHA-256: e23492889c8892b0de84e5b0b74a790150a2f146f4929969090dc61e7588ac5c
172 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan', and an ML classifier indicating high maliciousness. The document contains embedded JavaScript and presents a deceptive download button, aiming to trick users into clicking malicious links. Many of these links point to external PDF files, some hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://auburn-properties.com/userfiles/files/71060874441.pdf In PDF document text
    • http://cnpair.com/userfiles/file/13761395243.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17574351258.pdfIn PDF document text
    • http://dmkert.hu/files/file/25225304520.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/30903871275.pdfIn PDF document text
    • http://domario.ru/userfiles/file/powabusaruzobejamila.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/xaxibabidedabubaron.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/rebaroxosavomiwisibor.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/498ec0b4efcc07b0690f691333c075c4/31524881093.pdfIn PDF document text
    • http://m2m2design.com/userfiles/dunemirerifer.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/pufuzubamubovoli.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/mekigujezawuladolusipuxoz.pdfIn PDF document text
    • https://eguiders.com/uploads/fixemalipi.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/gitusud.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/xofajenekozilisapebo.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/zukufaniveropaguponi.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/zivonimisefosefinedodena.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///79975893027.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/97195450717.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/23234722340.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304cf816239---63654156063.pdfIn PDF document text
    • http://theponghop.com/upload/files/pujirogefetelezupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+apk+editor+windowsPDF 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_off0000e2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 18284 bytes
SHA-256: af2ad2b03f1a6421088d58d7800856c25455af2888e3b0d7da2a08039d68caaa
font_01_sfnt_off0001129e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129E 10496 bytes
SHA-256: 16e1af2187af3e8cdeff293b61c31c09402b59586fd142de2e4656d008fd8ee8
font_02_sfnt_off00012ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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