Malicious PDF — malware analysis report

Static analysis result for SHA-256 279426aaefae82e0…

MALICIOUS

PDF

77.6 KB Created: 2021-09-09 20:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 2738165b540f99d5d376c49640d0ffaa SHA-1: 9719923e6bac4460b21c60940b65c8307974fa7d SHA-256: 279426aaefae82e0a3909317ad6f2c837b2e8c6884038a27d173b933422878d3
164 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. 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 0.9980

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
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=unblocked+games+bullet+force PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613532f8468b7---10000381885.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/lozevatalapiw.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/5663095353.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/98793722560.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/2504402639.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/rl3ehdspbmrltq5lpgadr6g8j0/gorusiwonad.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/92568620184.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/zomamonomukitabi.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/dm14551hseb0rs4mf34tm9af3l/23029393788.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109071053051966.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/vokavivelaxu.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/92690238875.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/lulitumufazop.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/48486344353.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/bofupabolon.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/11956531183.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/nofifasefetego.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc2de4febd---75194656382.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/82528227701.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/batapibikojawobenozuj.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/fonijida.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe67742bb2---xekixafiximareniwotun.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E2 11064 bytes
SHA-256: e7fcd0d2f136d59a320442efadc05acd3e2f3fbc146f954a742786ba48e7b39c
font_02_sfnt_off0000fc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7A 17016 bytes
SHA-256: d432c375dc2f2d0284eb666e5de120f73b1ab8d2e1d27a6ff173d2d58786f648

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