Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa397c281651ca6a…

MALICIOUS

PDF

169.2 KB Created: 2021-09-06 12:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 749b7b0546d93d629b184d3df870de5a SHA-1: e6c5e72239b6390dd014b8e569d5007e87d23299 SHA-256: fa397c281651ca6ad2cc42254ae791bfe6afabd72ccdcca01bc300fcbb366efc
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains a link farm pointing to compromised WordPress sites, suggesting it's designed to redirect users to download further malicious content. The presence of multiple external URIs and a link farm on disposable hosting reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://playerpress.com/ckfinder/userfiles/files/gazatujenanejiwunavonisop.pdf In PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf3222e81a---tovobo.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160edee993320b---bufibudenexeroviz.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/48760344555.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f9c86becdc9ae2ad08f61824afcaa195/20749960790.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/67382427550.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/fujogiwipavejiziwoliz.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com//ckfinder/userfiles/files/dujedijufifot.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608004fabe6c3---bilofowasufobojixulazubup.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/31424061185.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210712194303.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/60407875220.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/zuwuvat.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbdafa37ddc---kefevivaxama.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/40226238974.pdfIn PDF document text
    • http://proxima-design.cz/files/file/16796804409.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/dc906068fdfc4d4ad914f11a91758f23/7228230335.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/gikeb.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/rugagud.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/xefefuwomerujuwulaxi.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/00bb436f8e5f8b1fffbea171b1333942/23501663634.pdfIn PDF document text
    • https://anjingliar.com/contents//files/revoneza.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/vawawokosutenawove.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f57e618b2---mewemofugukizutiwilix.pdfIn PDF document text
    • https://maisonforville.be/documents/file/zasapiwuni.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943fc8a2573---56934745265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cours+physique+quantique+smp+s5+pdfPDF 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_off00022aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22AA8 11244 bytes
SHA-256: 653563c830626da90255bc2a96dfc2c86a4e037ef8419b0697626e63b50427f0
font_01_sfnt_off000244bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x244BB 22460 bytes
SHA-256: 9d6f3d8dfd673d1a24b73669ba84abe779a94604211b3bd286f358bc45757baa
font_02_sfnt_off00027e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27E4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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