Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad359efca38b1bd2…

MALICIOUS

PDF

68.7 KB Created: 2021-09-05 09:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 36acf717775abc690102a9b419b1bc97 SHA-1: b07e8e7585b6d76e4cfb3c67d52a8366232bedb3 SHA-256: ad359efca38b1bd243153180882b9e6af01351be2fcfa362b8630b62af40f3ff
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure, containing a full-page image designed to trick users into clicking a link. This link directs to a compromised WordPress site, which in turn hosts another PDF. The presence of multiple links to compromised CMS upload storage and disposable hosting, along with a high ML score and ClamAV detection, strongly indicates malicious intent. The document's structure and URL patterns are consistent with phishing campaigns aiming to deliver further malware or redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 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://queure.ru/uplcv?utm_term=divorce+law+in+the+philippines+pdf PDF link annotation
    • http://euroteam.vn/ckfinder/userfiles//files/40243500313.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df269f88868---55369647376.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/32861171233.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/sarukiberonawediwavaf.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/pijebagusaj.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/33q5aeekf2tfoc6k5rf55tr7i5/lumevojub.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/katifebuwivabivetobolo.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/jamivajoga.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/da9084f4492a8868fc7913c6db78a840/zitejavagijumuz.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/rugemeleguboxot.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/62227408823.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8ba4dddf8---56692390268.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/72918606325.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160a0676182dad---59360733515.pdfIn PDF document text
    • http://splogservice.ru/content/file/losevubufekofe.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2e1b35052---ralalumojovefopimixe.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d33d4a9c116---86686963119.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/varuvozado.pdfIn PDF document text
    • http://cochemical.com/upload/files/98810629828.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ca590b7f5---23116252954.pdfIn PDF document text
    • http://kotolantopeni.cz/file/pobubexaxejepajomarifofu.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_off0000b0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E2 10868 bytes
SHA-256: 53982cefe1e3b454b1fb81f38ee059eddb7647fd2cf56973f9c8bec7f43fa6f8
font_01_sfnt_off0000c9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20D 14112 bytes
SHA-256: 8ca5ba77cbd8af494f4ee1969f6d69ca1ce3dd4a7cfe3a751d6e1682bc248f76

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