Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5cfe1559baf5d74…

MALICIOUS

PDF

87.5 KB Created: 2021-09-19 06:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f887b7a015adf9e1ba6659e401a605d0 SHA-1: c709e240f687a88930cebb1056a8733d79e775e8 SHA-256: c5cfe1559baf5d740c842fc372822cd06b9e58f4a42a40ee6237a895a6e9b902
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and a visual download button lure, suggesting it's designed to trick users into downloading further malware. The presence of external URIs and compromised CMS upload links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=plants+vs+zombies+pc+apk+free+download PDF link annotation
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613761d4e3aa4---69118575573.pdfIn PDF document text
    • https://network-italia.it/file/pimexifanujolaxabuvov.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/jijomakawonud.pdfIn PDF document text
    • http://lagrupacio.cat/file/vibulexitopobupef.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/vavetikasazodu.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3bb268f1---89280403873.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/4585000343.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/65988759860.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/juxamifememozagipi.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/n014eqv5qpe4cqt019palmdmfp/monuxunuxijitaf.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/walasixipa.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/89468593792.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/65017725467.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9639d3fcd---benafosiponexaxajaf.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/93011564454.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/b4d51d7f3271f9d77f85d250d172a0fc/63988643182.pdfIn PDF document text
    • http://ativn.com/upload/file/xugewozimagoraxekifo.pdfIn PDF document text
    • http://llux.vn/uploads/files/xufediguwata.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e2ad48c6125e5a2212cf80d053b15df/88698581165.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/685ses9t1an1re9pilrjfjqul1/borotobuwibezikonofulolo.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202193845507367.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/94297896127.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/milaxelanefe.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/30566133676.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_off0000e4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F0 11228 bytes
SHA-256: 4b2a9df1ba85433568bcd5ab7b6211ccd8f4369de4c0c89cbb4a95c03b94c7e8
font_01_sfnt_off0000ff1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1A 22016 bytes
SHA-256: 07c652b384055ba45ea86b5cf19b0b10503c45a891b28e14d3f2a40cd336769c
font_02_sfnt_off00013869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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