Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85084022d962bc4…

MALICIOUS

PDF

68.2 KB Created: 2021-09-24 00:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6146448f34434ba24f70bcdd9e78d45c SHA-1: 7c597f01a744a6ac56676fcc6091e7494ff90963 SHA-256: e85084022d962bc41a43cf0a13b7f8a760c5f0d695146a3a0ad0241cec74d199
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous external URIs pointing to potentially compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to redirect users to malicious content. The document's structure, being image-heavy with minimal text, further supports its use as a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 2 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://smidgel.ru/uplcv?utm_term=d%26d+starter+guide+pdf PDF link annotation
    • http://surveycook.com/upload/tmp/202109/file/besoxilakuparotuwe.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/7593560829.pdfIn PDF document text
    • http://spakimthi.com/upload/files/50241494845.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161481cd4e3db0---loxenetukivu.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/15442380610.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/3388144300.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/nuvemogobemusexopoz.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/68818009496.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3ffadf5b0---fotixexokalibeboxomorupe.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/ruridowag.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d2dcd5572---zasozelisotivozan.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f5d482c1c63c61076a753911239eeee1/7463786696.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/81506274763.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/mijisedavored.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/49095315565.pdfIn PDF document text
    • http://sivam.pl/files/file/womaribafeperigo.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/xopixokinegukazef.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/11046643997.pdfIn PDF document text
    • http://teakdeck.pl/files/file/34753779993.pdfIn PDF document text
    • http://praguetransfer.com/files/file/kekebozuxutijogi.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/zimimejevupedexosubub.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/tamefububazifipi.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/gumup.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a21d93b04---77555452709.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16140e8e5c7f71---lobojaxurunedab.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_off0000b4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0E 14376 bytes
SHA-256: 2f52d42d9a69d252e6630ec6809386fed1ece250d3698d924569e33171dc4990
font_02_sfnt_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8