Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aff4375f786c95a…

MALICIOUS

PDF

72.5 KB Created: 2021-06-09 15:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 18e560a677a000396b5571eb2d33b168 SHA-1: 3d0e297cbb733aee3f042606c27988bda9c3f2b9 SHA-256: 2aff4375f786c95a5c1369082f014d3f0d42af93bb45fd46749dc636b08b19bd
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://pistant.ru/uplcv?utm_term=tamilrockers+conjuring+2 PDF link annotation
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/bdae009e770e35ddbb7b210ec09e33e9/13827586107.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/xiviputugod.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098ada89a0fe---volowawagonosenusibekega.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094dbd92b0a3---funudilinod.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/xinovulezidujazori.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/89689236364.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/kkp9v2jc5495qljmfpgpof0tj2/97737911282.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/fotel.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/71839460091.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704e1584b43---60319734402.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/85d1ea127989207a9b18d5744e7d4436/76251608960.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/aa9815b83ad4d090701be30338e2f717/82496642648.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/nepemiduxusap.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/18766345149.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607402abcc9a7---fataja.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000d462.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD462 11828 bytes
SHA-256: 4849a84c3c4194652aeead7443fae4d0da8d0f0022d1076b6c96c8d946a06f9a
font_00_sfnt_off0000c247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC247 5340 bytes
SHA-256: e5564580a5b3d48de1322968fbe502135eb210a0de64871a92f6f1ceb27bb7f8
font_02_sfnt_off0000f137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF137 10544 bytes
SHA-256: d95cad1cfc752f8d5876224c100e25fd3e357e667301bbc9811f418febcc53fc

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