Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2606553b7b226fa…

MALICIOUS

PDF

70.0 KB Created: 2021-09-30 11:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2d1631bf92dcdc6d1fe1f012ca512bec SHA-1: 53fdf14261db0c5ef9a0b1efa5ee385204823d9c SHA-256: c2606553b7b226fab39261167fe76115f09c42979877a25ab537382512e0692c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting an attempt to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farms points towards a strategy of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 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://krisoc.ru/uplcv?utm_term=dragon+ball+xenoverse+1+download+android PDF link annotation
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614a40934d69e---78250506122.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/58273874412.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476ac22dc4a---34534378718.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409723ca34c---vizikijakolezufafuvopok.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/80123929563.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/regusu.pdfIn PDF document text
    • https://kristinanamaste.eu/files/88622301616.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161434da6daee8---dukizitusasunukulosusit.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/11fb711a7af85f0e3264befa66522e4a/37032624671.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/74226753818.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/50150863419.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16149dab921556---pedobipamelipuw.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/85153325877.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210917142001.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210903031539.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/92554874258.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/62203150225.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/15241103761.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4cbc2149f41e3671f7d388d6ffb0d2a9/gojiwovotiku.pdfIn PDF document text
    • https://synersys.fr/contenu/file/bajelelo.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/bcgv1tmf3s6dq0c75i42v6d7hm/37833751808.pdfIn PDF document text
    • http://allier-genealogie.org/File:/55205864717.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/f31e09cbdc980956b3b5e0e867097ebe/folelajafadenovisadikux.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_off0000afb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB8 16432 bytes
SHA-256: a824e4866547e89d5095ac3e0cf224532228143b82412aa7e266ed8d40f7c580
font_01_sfnt_off0000d9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C7 10772 bytes
SHA-256: ec9eb1d124bae40c512ab13e87ea49f2f7bf0264a98b5958ad2bddfcf6f2e21c
font_02_sfnt_off0000f292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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