Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a53a6baaf0db15…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 14:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0218928bad11e09edc63cc18a16824ed SHA-1: cbeac281f4743fdb50e79affaa3dd78213c58330 SHA-256: f3a53a6baaf0db1512eeb41d21f7c49e543160b57c468f118ad6b62c7f1dcb96
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://xn--eyt274i.com/upload/files/gamukexorafatudululefed.pdf In PDF document text
    • https://piphoto.tw/uploads/files/202109042102262092.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/zilotonubixefolo.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/50390168655.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/15595532995.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/mepukuj.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/vejuwigepofejigopefig.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/96005122599.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/lepovasokazezeke.pdfIn PDF document text
    • http://banquat.com/userfiles/files/gixetumozokidamiwudetetox.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e2bf75ac3560b213e9f6a7fa43b8e6e2/betadase.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/30044112086.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/6719c23da8543ee4d588d8ff1f97cc20/39671477828.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/097bf64e4ada3ba15780ae4029eea1b7/60295384425.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6aacdcf1bc36fb7a10c080dd82518019/vajexopesagalixebuxo.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140490e613cb---42959200161.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/1582168044.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee354e79fd---29215587204.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/fubunatusuwoxifamimer.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/telipu.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/ganoboxe.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/92927488158.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7696e03ea---tawonelunotadufuxipebop.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/42569185672.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/29c54858df7f2adcb26cf2b38bd79f8d/nixedobapixonekarudawax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=top+war+battle+game+android+1PDF link annotation
    • 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_off0000b55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD71 10808 bytes
SHA-256: a4179437915008e173c46f341fce817d01c7d72b80016c74b9343a719a44bc4f
font_02_sfnt_off0000e5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F7 15860 bytes
SHA-256: bef76ab103db338db4cf0884f22165bd8f3d99987bde06695f2eecfb654ade05

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