Malicious PDF — malware analysis report

Static analysis result for SHA-256 daef9501aa3b43e3…

MALICIOUS

PDF

68.2 KB Created: 2021-09-06 01:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 44747d45eb67dc8e36d509792b0fa246 SHA-1: b872177d5a33f8d3679d7bbc8fbd68fd214a48f7 SHA-256: daef9501aa3b43e379132e708089b3d2da18ca6e19e9ec6eb7033fffae902877
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The 'Image-only document with action trigger' heuristic indicates a common tactic where a screenshot is used to mask a clickable element leading to an attacker-controlled URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://allytemp.ru/uplcv?utm_term=free+printable+consonant+sounds+worksheets PDF link annotation
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bowobapejunalixabomas.pdfIn PDF document text
    • http://asid.rw/userfiles/file/91744045816.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/c69686f4c008a29b272f10f122b92c9f/malamudoxuxemilalafaze.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607437682ace2---98003086342.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/lofiwesixomofufax.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/8cb741b8c4f9f4b6e82e59786ff5d668/vabibezunawe.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/65445136235.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/47394416991.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/butugadit.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/losesedidibix.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112df00882cd---jaxadajagoju.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/josidupanuvivazodetuxuzor.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/sajutoferipipi.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/4701193971.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/mikudakowage.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/mosenowupizi.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/jamoloxodiloxaxemurulo.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/f67444133090b55838954e92160c1726/13700264567.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/25884844745.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210609/file/xipexijunuvalaki.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/84659943496.pdfIn PDF document text
    • http://maxbrio.kr/files/files/binena.pdfIn PDF document text
    • 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_off0000ae9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B2 11008 bytes
SHA-256: d83b7bfb8395f8b992dfcb27ce78867348d0c190a5c07b1439760821e1d85646
font_02_sfnt_off0000dffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFA 14364 bytes
SHA-256: 6815adeafec88bfad008c4d43c3600769eea5a7ae34b873fa0149885696b0556

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